Answers
Answer:
Darwin's theory of natural selection states that organisms evolved from their common ancestors over a long period of time.
Hope this helps!
Related Questions
For each of the four traits, decide which of the possible genotype crosses could represent the family you studied. For example, if both parents express the dominant trait, and only two of three children express the dominant trait, then the parents must be Aa and Aa. Otherwise, if the parents were (AA and Aa) or (AA and AA), all of the children would express the dominant trait. Only the AaxAa table is consistent with two dominant phenotype parents having children that are both dominant and recessive phenotypes.Remember that in each case, the capitalized phenotype (T, H, B, E) represents expression of the dominant gene, and the lower-case phenotype (t, h, b, e) represents expression the recessive gene. Remember also that the phenotype T could be produced by the genotype TT or the genotype Tt, while the phenotype t can only be produced by the genotype tt.Submit your conclusions about the genotypes of the parents for each of the four traits, and an explanation of how your data supports your conclusions. Use paragraphs with complete sentences and proper English grammar.That's the chart of my family and their traits persontongue testhair testeyes test ear testFather t H B eMother T H B EChild 1 t H B EChild 2 T H B eChild 3 T H B e And here's some helps and hintsFor the Tongue test, the three genotypes would be TT, Tt, and tt. That means the unique crosses are:TT x TTTT x TtTT x ttTt x TtTt x tttt x ttNow that you have a list of all possible crosses, it is time to start eliminating ones that are not possible (do not agree with your Part 1 data)....Start with the parents phenotypes:(Remember, the dominant phenotype, T, means the genotype could be either TT, or Tt.... The recessive phenotype, t, means the genotype is tt.)What is the father's phenotype?What are the possible genotype(s) for that phenotype?What is the mother's phenotype?What are the possible genotype(s) for that phenotype?Now, look at the six possible crosses. Eliminate any where the genotypes disagree with the possible genotypes you just listed above....Next, look at the offspring/children:Which of the following accurately describes the offspring/children?All have the dominant phenotype.All have the recessive phenotype.Some have the dominant phenotype, and others the recessive phenotype.Finally, look at the Punnett squares for each of the crosses that you were unable to eliminate using the parent's phenotypes..Eliminate any that have a 0% probability/probability of matching the children/offspring phenotypes.....What remains will be a list of crosses that agree with each parent's phenotype, and that also have some possibility of matching each offspring/children phenotype, too.List those crosses. Then, for each, explain how it is a possible match.Once you finish with the Tongue test, do the same for each of the other traits, too.
Answers
Here they are telling us the phenotypes of a family for four traits, with the alleles represented by the letters in brackets:
• Tongue (T/t)
,• Hair (H/h)
,• Eyes (B/b)
• Ear (E/e)
The capital letters represent de dominant allele, and the lower case represents the recessive allele.
They are giving us the following phenotypes for a family and asking us to determine the parent's genotype:
• Father: t H B e
,• Mother: T H B E
,• Child 1: t H B E
,• Child 2: T H B e
,• Child 3: T H B e
We can start with the recessive phenotype because we know for sure that they are recessive homozygous, which means they have two copies of the recessive gene.
• Father: ,tt, H B ,ee
,• Mother: T H B E
,• Child 1: ,tt, H B E
,• Child 2: T H B ,ee
,• Child 3: T H B ,ee
Why is it important for scientists to use scientific names and not common names?
----------------------------------------------------------------------------------------------------------
A. Common names can be confusing and don't translate the same in every language.
B. Common names are more accurate than scientific names.
C. Scientific names can be confusing and don't translate the same in every language.
D. There are several scientific names for each organism.
Answers
Answer: The answer is c
Explanation:
Answer: A
Explanation: The same common names could be used for any animal and it could cause alot of confusion. Names in latin are easier bc they are more specific
Conservation of Mass Activity Worksheet
Instructions: Observe and analyze the interactions between the substances pictured in the slide show. Compare the properties of substances before and after each interaction. You will submit your completed worksheet for grading.
Data Table
On the table below, record your observations before and after the interactions and explain how mass was conserved. Describe the changes in properties that prove a chemical reaction occurred. The first row is an example.
Observations Before Interaction Observations After Interaction How was mass conserved? Proof of a Chemical Reaction
Example: Sugar + Heat The sugar is in tiny white particles in a pile. Heat is not seen but is implied by the heat source. The pile of sugar in the pot has a mass of 100 grams. There is a solid, light brown mass at the bottom of the pot. It has a mass of 100 grams. The mass of the sugar is the same in melted form as it is in solid crystal form. There was not a chemical reaction. Sugar did not change composition. It only melted. Melting point is a physical property, and this is a physical change.
Steel Wool + Oxygen (Fire)
Egg + Heat
Water + Heat
Zinc + Hydrogen Chloride
Sodium Hydroxide + Copper Sulfate
HELPPPP PLEASEEEEEE
Answers
After Interaction How was mass conserved it is discussed below:
Steel Wool + Oxygen (Fire): chemical change
Egg + Heat: chemical change
Water + Heat: physical change.
Zinc + Hydrogen Chloride: chemical change
Sodium Hydroxide + Copper Sulfate: physical change
What is conservation of mass?According to the rule of conservation of mass, no atoms are lost or created during a chemical process. Instead, the atoms combine in various ways to generate products. This is why the number of atoms in each element in a balanced symbol equation is the same on both sides of the equation.
Steel Wool + Oxygen (Fire):The steel wool is a grayish color and has a rough surface. Oxygen is transparent It looks like a powder, and like if it was rusted steel wool but then broken apart and turned into a powder Well Iron oxide is 7 grams and steel wool combined is 7 grams so that the mass was conserved Yes, this is a chemical change because the steel wool rusted and rust is a chemical change, so iron oxide is cause because if a physical change.
Egg + Heat:The egg has a yellow yolk in the middle while there is some type of liquid at the border of the yolk, but it is clear, the heat is hot but transparent The egg turned into a delicious food called an omelet what was yolk staid as a liquid but got a tad harder, but the transparent border around it turned white It was conserved because the eggshell was 4 grams and the fried egg is 41 grams It is a chemical change because it results in the formation of new particles, and the chemical bonds break up and new ones are formed.
Water (H₂O) + Heat:The water is a clear liquid, while the heat is very hot but transparent The water turned into a type of oxygen -Water Vapor- If 5 g of water becomes a gas it becomes 5 g of water vapor. The mass of the liquid water is simply transferred into the mass of the newly formed water vapor. There was no chemical reaction because the water vapor can be turned back to water also it just changed from a liquid to a gas and did not change its composition. So, it is a physical change.
Zinc (Zn) + Hydrogen Chloride (HCl):Zinc: a white/silver metallic solid. Hydrogen chloride (dilute hydroelectric acid) a transparent, colorless liquid with a very low pH (acidic). Zinc "dissolved" in hydrogen chloride, while emitting a colorless gas. The liquid remains a colorless liquid, possibly still having a low pH from the unused acid. The colorless gas collected in a test tube gives a popping sound when ignited with a burning wooden splint, so it is not air embedded in the zinc, nor dissolved in hydroelectric acid. Well although the zinc chloride is 12 grams and not 15 the gas that was released was 3 grams and as we all know 3 + 12 is 15 so that the mass was conserved The production of a new substance (most probably hydrogen) from the reaction of the two reactants. When a few drops of the liquid product are evaporated on a watch glass, a white residue is left. When a few drops of the liquid hydroelectric acid are evaporated on a watch glass, there is no residue. This proves that a new product (hydrogen gas), (white powder, zinc chloride) is produced instead of zinc being physically dissolved in hydroelectric acid. So, it is a chemical change.
Sodium Hydroxide + Copper Sulfate-Sodium hydroxide is a turbid solution and copper sulfate is in form of bright blue crystals. When their solutions are mixed with each other, a pale blue precipitate of basic copper hydroxide & a solution of neutral salt sodium sulfate will be formed. The sodium hydroxide and the copper sulfate combined make a total of 67 grams and the product is split because the sodium sulfate is 47 grams and the copper hydroxide is 20 grams but all together it is still 67 grams so you could say that the mass was conserved. The proof of the reaction is the appearance of pale blue precipitates of basic copper hydroxide & a solution of neutral salt sodium sulfate. So, it is physical change.
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Lab Intro - The Metric System
Exercise A - Measurement or distance
Someone help please
Answers
The metric system is a system of measurement that is utilized throughout the world. The fundamental units of the metric system are meter, gram, and liter. In this system, prefixes are used to represent measurements that are bigger or smaller than the fundamental units.
The prefix “kilo-,” for example, indicates a measurement that is a thousand times bigger than the fundamental unit. Lab Intro - The Metric System Exercise A - Measurement or Distance The metric system is used to measure length or distance.
The standard unit of length in the metric system is the meter, which is represented by the symbol “m.” The metric system is used to measure distances or lengths that vary from millimeters (mm) to kilometers (km).In order to determine measurements in the metric system, the fundamental units are combined with prefixes.
For example, one centimeter (cm) is equal to 1/100th of a meter, while one millimeter (mm) is equal to 1/1000th of a meter. One kilometer (km), on the other hand, is equal to a thousand meters (m).
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what are three possible reasons the iguanas are disappearing in the Galapapagos islands
Answers
Answer:
Explanation:
Their habitats are possibly being destroyed, iguanas are possibly being a food item to people, or their reproduction rates/eggs not hatching.
the meaning of photosynthesis in paragraph
Answers
Photosynthesis is a biological process that occurs in plants, algae, and some bacteria. It is the process by which these organisms convert light energy from the sun into chemical energy in the form of glucose (a type of sugar).
Can you help me figure out the answer for emma.
Answers
First, to understand our results we must remember a little about how the tests and blood type works. We have two types of antibodies A and B, the absent phenotype is O, and the Rh that is another antibody. When we do a test, we use antiserums that will react to the presence of one of these two antibodies A and B, and it is characterized by agglutination of the drop of blood in the sample.
In the present case (Emma) seems in the photo, like there is no agglutination reaction which would be an O type, that is to say, it doesn't have A nor B antibodies, and accordingly to the exercise mother (Emily) and father ( Ernest) one is B and the other is A, so Emma wouldn't be their biological daughter, the likelihood is very low. The only possible genotype for someone O, is (OO) because is a recessive character.
A few notes: As far as it is visible on the photographs the blood doesn't look like there is an agglutination reaction, but it could be due to resolution, so it must be looked at carefully, nonetheless, when we see the next sample the one of Ernest it is possible to see agglutination if you look carefully at the A pit, it looks like there is a little of sand or some kind of residue, which is none other than the agglutination reaction, making Ernes positive for A antibody.
How do you think hot paved roads affect the air above them?
Answers
Answer:
Hot paved roads can have several effects on the air above them. Here are a few ways in which hot paved roads can impact the atmosphere:
Heat Island Effect: Hot paved roads contribute to the urban heat island effect, where urban areas experience higher temperatures compared to surrounding rural areas. The asphalt absorbs and retains heat from the sun, raising the temperature of the road surface. This, in turn, increases the air temperature in the vicinity, leading to a localized increase in temperature.
Increased Air Temperature: The hot surface of the road can cause the air directly above it to warm up. This can create a layer of warm air near the ground, which may result in higher ambient temperatures near the road. The increased air temperature can have implications for human comfort, energy consumption for cooling, and the overall microclimate of the area.
Altered Wind Patterns: Hot paved roads can influence wind patterns. The temperature difference between the road surface and the surrounding air can lead to the creation of convective currents. As the warm air rises from the road surface, it can affect local wind circulation patterns and potentially create small-scale convection cells. These altered wind patterns can have implications for local weather conditions.
Emissions and Air Quality: Hot paved roads can contribute to increased emissions and air pollution. The heat can accelerate the release of volatile organic compounds (VOCs) from the asphalt and other materials used in road construction. Additionally, higher temperatures can increase the rate of chemical reactions in vehicle exhaust, leading to higher levels of pollutants such as nitrogen oxides (NOx). These emissions can contribute to air pollution and have adverse effects on air quality in the area.
Atmospheric Stability: Hot paved roads can affect the stability of the lower atmosphere. The warm air rising from the road surface can create localized thermal updrafts, which can influence the stability of the surrounding air mass. This can impact the formation of clouds, the vertical mixing of pollutants, and the dispersion of pollutants in the atmosphere.
It's important to note that the specific effects of hot paved roads on the air can vary depending on factors such as local climate, urban design, traffic density, and the characteristics of the road surface.
Explanation:
Stress is a nondietary risk factor for
cancer
hypertension
osteoporosis
diabetes
Answers
I would say hypertension, I think stress can be a risk factor for this.
Answer:B
Explanation:
How do people adapt to the hot climate
Answers
CAN SOMEONE TELL ME IF IM CORRECT
i basically already did it but I just need someone to tell me if im correct
Answers
Answer:they all seem pretty good but i would double check just in case
Explanation:
I will give brainliest points
A student is looking at a single-celled organism under a microscope.
The presence of which structure would indicate that the cell is eukaryotic?
Choose 1 answer:
(Choice A)
A
DNA
(Choice B)
B
Cytosol
(Choice C)
C
Cell membrane
(Choice D )
D
Nucleus
Answers
Answer:
d nucleus
Explanation:
PLEASE HURRYYY!
What is the main mechanism for bacteria reproduction?
Answers
Answer:
binary fission
Explanation:
What is chrosome ? (Definition in own words )
Answers
Answer:
A structure found inside the nucleus of a cell. A chromosome is made up of proteins and DNA
Explanation:
:)
Answer:
a chromosome is a long DNA molecule with part or all of the genetic material of an organism. most eukaryotic chromosomes include packaging proteins called histones which aided by chaperone proteins bind to and condense the DNA molecule to maintain its integrity.
Currently, the world population is approximately seven billion people. About 20 percent of the world's current population lives in China. If China experiences a 5 percent decline in population in cach of the next five years, and if the rest of the world experiences a 2 percent growth in population in each of the next five years, at the end of the five-year period, what percentage of the worid's population will live in China? (You may round your answer to the nearest percent.)
Hint: First calculate the actual numeric figures of the current population of China (20 percent of 8 billion) and also the current population of the rest of the world (80 percent of 8 billion). Then apply the rates of dealine to "China's population figure" and the rate of growth to "the rest of the world's population figure" before calculating your final answer.
Answers
At the end of the five-year period, approximately 14 percent of the world's population will live in China.
To solve this problem, we first calculate the current population figures for China and the rest of the world.
Since 20 percent of the world's current population lives in China and the world population is approximately seven billion, the current population of China is 20 percent of seven billion, which is 1.4 billion.
The population of the rest of the world can be calculated as 80 percent of seven billion, which is 5.6 billion.
Next, we apply the decline and growth rates to the respective population figures over the five-year period.
For China, a 5 percent decline in population each year for five years means multiplying the current population figure by (1 - 0.05) five times, resulting in a final population of approximately 1.07 billion.
For the rest of the world, a 2 percent growth in population each year for five years means multiplying the current population figure by (1 + 0.02) five times, resulting in a final population of approximately 6.4 billion.
To find the percentage of the world's population that will live in China at the end of the five-year period, we divide China's final population by the sum of China's final population and the rest of the world's final population.
This gives us (1.07 billion / (1.07 billion + 6.4 billion)) \(\times\)100, which is approximately 14 percent.
Therefore, at the end of the five-year period, approximately 14 percent of the world's population will live in China.
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The valve present between right atrium and ventricle is
Answers
What macromolecule is the enzyme ATP synthase?
Answers
Which of the following inferences about the character of Mother is best supported by the story's paragraphs below?
SADAKO. Mother, Mother! Wait till you hear! I have wonderful news!
MOTHER (not looking up, continues working). Your shoes, Sadako.
SADAKO. Oh. (She calms down to remove her shoes, puts them by the door, then rushes back to MOTHER.) Wait till I tell you!
MOTHER. Sadako, show your respect to your elders.
SADAKO. Oh. (She bows, puts hands together as in prayer and bows her head toward MOTHER.) Mother, Kenji just told me...!
MOTHER. Sadako, show your respect to our beloved ancestors. (Disheartened, SADAKO kneels before an imaginary shrine, hands in prayer and
bowing her head. Returns to MOTHER, somewhat subdued.)
A. The Mother is a strict disciplinarian.
B. The Mother is disappointed by Sadako's behavior.
C. The Mother wants to impart her tradition to Sadako.
D. The Mother knows Sadako has leukemia and therefore does not want her to get too excited as it poses danger to Sadako's health.
Answers
The Mother is a strict disciplinarian. This inferences about the character of Mother is best supported by the story's paragraphs. Therefore, the correct option is option A.
A short tale is a succinct fictional narrative in prose that is less than a novel in length and typically only features a small cast of characters. The focus of a short narrative is typically on a specific consequence that is expressed in just one or a few key episodes or scenes. The structure promotes brevity of story, economy of setting, and the exclusion of complicated plots.
Character is rarely fully established but is revealed through action and dramatic interaction. Despite its generally constrained scope, a short tale is frequently assessed by how well it treats its characters and main idea in a "complete" or fulfilling way. The Mother is a strict disciplinarian. This inferences about the character of Mother is best supported by the story's paragraphs.
Therefore, the correct option is option A.
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Compared to an exoskeleton, what advantage does an endoskeleton provide an animal?
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Answer:
An endoskeleton provides better structual support and can withstand physical force better than exoskeleton.
How does the current affect plankton and nekton life?
Answers
Answer:
Advection by ocean currents modifies phytoplankton size structure at small scales (1–10 cm) by aggregating cells in different regions of the flow depending on their size. This effect is caused by the inertia of the cells relative to the displaced fluid
answer the question below
Answers
Answer:
the answer I would say would be C
List and describe several ways in which a recessive trait might be eliminated from a family or population
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A recessive trait is often depicted as a lowercase letter, while a dominant trait is depicted as a capital letter. So, aa has two recessive genes, AA has two dominant genes, and Aa has both a dominant and a recessive gene. To eliminate the recessive gene, it has to have less of a chance of survival than the dominant gene. After a lot of time, if the aa or Aa gene keeps mixing with either AA or Aa genes, eventually the recessive gene will go away, although it will take many generations.
Can someone Help me please?
Answers
The two organisms that live near the elephant and show common ancestry are manatees and dugongs, which are members of the order Sirenia.
DNA, fossils, and embryos can be compared to show common ancestry.
What are the related organisms to the elephant?Elephants are members of the family Elephantidae, which includes two living species: the African elephant (Loxodonta africana) and the Asian elephant (Elephas maximus). Both of these species share a common ancestry and are members of the same order, Proboscidea, which also includes several extinct elephant-like species.
Some of the organisms that are closely related to elephants and also share common ancestry include manatees and dugongs, which are members of the order Sirenia. Both elephants and sirenians are believed to have evolved from a common ancestor that lived about 60 million years ago.
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Which of the following are valid ways to find out correct information about your health. Search the internet. Ask a trusted family member consult a doctor, nurse or qualified health professional none of the above
Answers
Answer:
Consult a doctor, nurse or a qualified health professional.
Explanation:
Doctors and Nurses are professionals in this field. From the options listed they are the only people who could give you valid information on your health. Getting your information from other sources could lead you to being misinformed, and that could have detrimental effects.
How is the cell division of cancer cells like these misregulated?
Select all that apply.
Such cells are not inhibited by density.
Such cells can divide in the absence of growth factors.
Such cells skip the G1 phase of the cell cycle.
Such cells do not require anchorage to a surface in order to divide.
Such cells do not respond to signals that normally trigger apoptosis.
Such cells do not need enzymes for DNA replication.
Answers
Cancer is due to irregularities in cell division that are caused by mutations in cancerous cells. These mutations inhibit apoptosis and favor cell division. Among the options, the correct ones are 1, 2, 4, and 5.
------------------------------------------
Cancer is the result of irregular cell division.
Its development and progression are closely related to changes in the cell cycle regulator factors.
Cancerous cells
• Divide when they should not do it ⇒ overactivity of the positive cell division regulators.
• Do not stop dividing when they should ⇒ reduction in the activity of cell division inhibitors
• Do not die when they should ⇒ loss of the apoptotic capability
• Leave the area where they are growing ad travel to other parts of the body ⇒ metastasis
Normal cells divide and die during a programmed period.
When a normal cell mutates or suffers from any alterations that can not be repaired, it automatically activates its apoptotic process.
However, cancerous cells lose the capability of dying and their reproductive inhibition, so they keep growing and dividing with no limits.
The unlimited division occurs because mutations in cancerous cells influence the cell cycle by favoring proliferation and inhibiting senescence and apoptosis.
These cells do not depend on external growth factors or other protein signals to divide.
Cancerous cells can release their own growth factor and even influence neighbor cells to produce and release these substances.
Cell division is constant even when there is no space.
Sometimes over multiplication creates tumors that might affect healthy neighbor cells and the tissue itself.
Among the options,
1) Such cells are not inhibited by density. CORRECT
2) Such cells can divide in the absence of growth factors. CORRECT
3) Such cells skip the G1 phase of the cell cycle. INCORRECT
4) Such cells do not require anchorage to a surface in order to divide. CORRECT
5) Such cells do not respond to signals that normally trigger apoptosis. CORRECT
6) Such cells do not need enzymes for DNA replication. INCORRECT
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Cancer cells can divide in the absence of growth factors. Cancer cells do not require anchorage to a surface in order to divide. Cancer cells do not respond to signals that normally trigger apoptosis.
Cancer cells can multiply without any growth factors whereas normal cells will not divide without the addition of growth factors. Cancer and tumor cells are less dependent on anchorage. They are free to proliferate, and invade tissues. A normal cell that have damaged DNA will undergo apoptosis while on the other hand, cancer cell with unfixable DNA will not undergo apoptosis and will continue multiplication.
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suppose the pendulm satred moving at postion 1 and continued to postion 5
Answers
The answers are
Position-3 with maximum Kinetic Energy
Position with the least Kinetic energy = 1, 5
Position with greatest potential energy = 1, 5
Position with Least potential energy = 3
Depending on its velocity and location, a pendulum's position can have varying amounts of kinetic and potential energy.
The position with the most kinetic energy is usually at the bottom of the movement, while the position with the least kinetic energy is usually at the top.
The position with the most potential energy, on the other hand, is at the peak of the swing, while the position with the least potential energy is at the bottom. These principles serve to explain pendulum motion and how energy is distributed throughout its swing.
Kinetic energy is the energy of motion and is defined by the mass and velocity of an object.
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the question is incomplete. complete question is
Suppose the pendulum started moving at position 1 and continued to position 5.
1. Position(s) with greatest kinetic energy?
2. Position(s) with least kinetic energy?
3. Position(s) with greatest potential energy?
4. Position(s) with the least potential energy?
Question
A farmer grows several crops on a farm that has mostly shallow, sandy soil. Which of the following irrigation methods would be the best suited for this farm?
Answers
Answer:
Explanation For a sandy soil farmer should use drip irrigation method over surface irrigation.
Sandy soils have a low water storage capacity and a high infiltration rate. Therefore they need frequent but small irrigation methods, drip irrigation is most suitable method than surface irrigation.
In other irrigation methods such as Surface irrigation, Flood irrigation, Furrow irrigation water is discharged in quite large amounts but the soil lost it due to the high infiltration rate.
Therefore, for a sandy soil farmer should use drip irrigation method over surface irrigation.
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For a sandy soil, the farmer should use drip irrigation method over surface irrigation method. Thus, the correct option is A.
What is Drip irrigation?Sandy soils have a low water storage capacity and a high infiltration rate. Therefore, they need to frequent however small irrigation methods such as drip irrigation. Drip irrigation is the most suitable method for irrigating this soil surface.
In other irrigation methods such as surface irrigation, flood irrigation, furrow irrigation, water is discharged in quite a large amounts however the soil still lose it due to the high infiltration rate.
Therefore, the correct option is A.
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Your question is incomplete, most probably the complete question is:
A farmer grows several crops on a farm that has mostly shallow, sandy soil, meaning they have a low water storage capacity and a high infiltration rate. Which of the following irrigation
methods would be the best suited for this farm?
Select one:
a. Drip irrigation
b. Surface irrigation
c. Flood irrigation
d. Furrow irrigation
Clones have the exact same:
A. personalities
B. physical appearance
C. intelligence levels
D. genetic material
(Explain a little)
Answers
Answer: Clones share the exact same genetic material, These offspring are genetically and morphologically identical, and they have the same DNA.
Rocks have been found in South America that are very similar in make-up and age to rocks in South
Africa. What might this evidence tell us about the plates under South America and South Africa?
OA. All rocks are the same; they can't be used be evidence for tectonic movement.
B. The rocks were probably formed when South America and Africa were
connected.
a
Oc. The rocks were probably deposited in both places when a tectonic plate broke
up.
D. Rocks are only produced when tectonic plates move against each other and
small pieces break off.
Answers
Answer:
B.
Explanation:
Once we were one big continent, so similarities on coasts of two different continents is evidence of them being once together
Which of the following shows the proper way to write a scientific name
using the "rules" I lectured about?