Most of the exchange surfaces of multicellular animals are lined with _________.
A. connective tissue
B. smooth muscle cells
C. neural tissue
D. epithelial tissue
Answers
Most of the exchange surfaces of multicellular animals are lined with epithelial tissue.
Epithelial tissue is one of the four major body tissues found in organs, lining the internal and external surfaces of the body.
It has different structures and functions depending on where it is located on the body.
The epithelium is a type of body tissue that covers all the internal and external surfaces of the body, lines body cavities and hollow organs.
Epithelial tissue has various functions, such as protection, secretion, and absorption, depending on where it is located in the body. The body organs are made up of four basic types of tissue, including:
Epithelial tissueConnective tissueMuscular tissueNervous tissueAll substances entering or leaving an organ must first pass through the epithelium.
There are various types of epithelial tissue throughout the body. Some examples of epithelial tissues are:
The outer layer of skin (epidermis).Intestinal mucosa.Airway lining.Inner wall of abdominal cavity.Sweat glandsLearn more about Epithelial tissue here : https://brainly.com/question/17301113
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Related Questions
Look at the Punnett square below. What genotype belongs in the first boxwith the red question mark?*Ddddd ?d DdddODDO DdOddO either DD or Dd, it doesn't matter which one
Answers
Looking at the Punnett Square in the question, the genotype that belongs in the first box with the red question mark is Dd, being a heterozygous for the trait.
suggest why single-celled plant organisms do not have contractile vacuoles
Answers
Answer:
Single celled organism do not contactile vacuoles
Explanation:
The point of the contractile vacuole is to pump water out of the cell through a process called osmoregulation, the regulation of osmotic pressure.
A student wants to perform an experiment to test the effect of different colored lights on the growth of basil plants. She sets up an experiment where multiple basil plants are placed in six different setups; one with red light, one with green light, one with yellow light, one with blue light, one with no light and one with sunlight. In each setup the plant receives the same amount of water, soil, and size of container. What is the independent variable in this experiment
Answers
Answer:
light is the independent variable, height of the plant is the dependent variable. Dependent is the effect that based on the independent.
Explanation:
lets break it down. 1) you want to know the effect of something you apply from one thing to another. Let say, if you grow your plants under the sunlight, the plants grow taller. In this case, the sunshine is the independent variable whereas the height of the plant/how tall it can grow is the dependent variable. 2)NOW, before i give the answer. The design of the question is not good for high school students. i think your teacher thinks "light" is the independent variable. 3)However, the question contains confounding variables in it because different lights might produce different effects to the height of the plants. If you want to test if plants are exposed to light grows taller than plants do not expose to light, then you should have all the lights are the same. 4) So, all the plants should be exposed to one certain light to avoid confounding. Confounding means that either red light and sunlight are both produce the same effect whereas the other colors do not help the plants to grow taller. 5)Your teacher should test one light at a time. So, if he is testing with all different colors of light, then light is the independent variable, and height of the plant is the dependent variable.
Unwanted outcomes of orthodontic treatment that can be prevented with proper oral
hygiene include
A. mouth sores
B. decalcification (white spot lesions)
C. gingival inflammation
D. B and C
Answers
Decalcification and gingival inflammation
Workers find two substances. One is a toxic chemical. The other is a safe chemical. Both chemicals are liquids at room temperature. As a test, the workers transfer the same amount of energy out of the two containers and find that only the toxic chemical changes phase. How is the toxic chemical different from the safe chemical?
(*) required:
*Correct answer
*Most convincing wrong answer
* Why is the wrong answer wrong??
Answers
Explanation:
the toxic chemical has different ingredients that makes it having a different reaction at the container
helppppp meeeeee plsssss
Answers
Answer:
Solar eclipse
Explanation:
Solar eclipse happens when the moon is covering up the sun. As the picture is showing, the moon is covering up the sun and casting a shadow onto the earth.
In an ecosystem, what are some living and nonliving things that affect the ecosystem?
Answers
Answer:
Abiotic factors refer to non-living physical and chemical elements in the ecosystem. Abiotic resources are usually obtained from the lithosphere, atmosphere, and hydrosphere. Examples of abiotic factors are water, air, soil, sunlight, and minerals. Biotic factors are living or once-living organisms in the ecosystem.
Explanation:
Some examples of important nonliving things in an ecosystem are sunlight, temperature, water, air, wind, rocks, and soil. Living things grow, change, produce waste, reproduce, and die. Some examples of living things are organisms such as plants, animals, fungi, and bacteria.
a botanist travels to an area that has experienced a long, severe drought. while examining the bryophytes in the area, he notices that many are in the same life-cycle stage. which life-cycle stage should be the most common?
Answers
The most common life-cycle stage that a botanist would likely observe in bryophytes after a long, severe drought is gametophyte. This is because in bryophytes, gametophytes are the dominant life-cycle stage in harsh environments with limited water availability. In these conditions, the sporophyte stage does not have the opportunity to develop and reproduce. .
To understand the life-cycle of bryophytes, it is important to first understand the differences between the sporophyte and gametophyte stages. The sporophyte stage is an asexual reproduction phase where a multicellular, haploid spore-producing structure develops on the gametophyte. The gametophyte stage is the sexual reproduction phase, where a multicellular, haploid structure develops and produces gametes (sperm and egg cells).
In harsher, drier conditions, the sporophyte stage has difficulty in developing and surviving due to limited water availability. As a result, the gametophyte stage has the advantage in that it is able to remain as the dominant life-cycle stage in such conditions. This is why the gametophyte stage is typically the most common after a long, severe drought.
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Look at the four devices below.
flashlight
lawn mower
solar calculator
desk lamp
Which device uses light as it's source on energy? ty if youhelp
Answers
every other option can be charged using batteries or power.
______ is a specialized type of cell division that produces cells that are genetically different from each other.
Answers
Meiosis is a specialized type of cell division that produces cells that are genetically different from each other.
Cell division is the process through which all cells are created from other cells. Meiosis is a specific type of cell division that generates reproductive cells like sperm and egg cells as well as plant and fungus spores. A "parent" cell generally divides into two or more "daughter" cells during this process. The parent cell can transmit its genetic material in this manner from generation to generation.
Meiosis is a specific type of cell division that takes place in sexually reproducing organisms. It generates reproductive cells like sperm, egg, and spores in plants and fungi, as was previously indicated. In humans, germ cells go through a process called meiosis to develop into sperm or eggs.
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Which is true concerning how fossils are used as evidence?
A. Fossils cannot be compared to one another but can be compared to living organisms.
B. Fossils can be compared to one another but not to living organisms.
C. Fossils cannot be compared to one another or to living organisms.
D. Fossils can be compared to one another and to living organisms.
Answers
Answer:
A ko false B ko true C ko false D ko true
Answer:
D
Explanation:
the outcome of a single crossover between nonsister chromatids in the inversion loop of an inversion heterozygote varies depending on whether the inversion is of a pericentric or paracentric type. what differences are expected? the outcome of a single crossover between nonsister chromatids in the inversion loop of an inversion heterozygote varies depending on whether the inversion is of a pericentric or paracentric type. what differences are expected? paracentric inversions produce four chromatids with one centromere each, while pericentric inversions produce an acentric and a dicentric chromoatid (both inviable). pericentric inversions produce only two genetically balanced products, while paracentric inversions produce no genetically balanced chromatids. pericentric inversions produce four chromatids with one centromere each, while paracentric inversions produce an acentric and a dicentric chromoatid (both inviable). paracentric inversions result in two dicentric chromatids and two acentric chromatids, while pericentric inversions result in four chromatids with one centromere each. pericentric inversions result in four genetically unbalanced chromatids, while paracentric inversions result in four genetically balanced chromatids.
Answers
The outcome of a single crossover between nonsister chromatids in the inversion loop of an inversion heterozygote differs depending on whether the inversion is of a pericentric or paracentric type. In a pericentric inversion, four chromatids with one centromere each are produced, but these are all genetically unbalanced.
In contrast, a paracentric inversion results in four chromatids with two centromeres each; two of these chromatids are dicentric, and two are acentric, but all four are genetically balanced.
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The sex of an organism is typically determined genetically, but environmental factors can also play a role. Scientists examined the roles of genes and environmental temperature in the sex determination of a lizard species. Individuals with a ZW
pair of chromosomes are always female (ZWf
), while individuals with a ZZ
pair of chromosomes can be either male (ZZm
) or female (ZZf
). Scientists mated ZWf
or ZZf
females with ZZm
males and incubated the eggs produced in 20 clutches at temperatures ranging from 23°C
to 36°C. When the young hatched, the scientists determined their sexes (Table 1). Among the eggs that did not hatch, the mortality of embryonic lizards was approximately the same for both males and females
Answers
The experiment examined the roles of genes and environmental temperature in the sex determination of a lizard species. The species has two types of chromosome pairs: ZW and ZZ. Individuals with a ZW pair of chromosomes are always female, while individuals with a ZZ pair of chromosomes can be either male or female.
To test the effects of genes and temperature on sex determination, scientists mated ZWf or ZZf females with ZZm males and incubated the eggs produced at different temperatures ranging from 23°C to 36°C. The hatchlings' sex was determined, and the data was collected in Table 1. The experiment found that at lower temperatures, the majority of hatchlings were female, regardless of their genetic makeup. At higher temperatures, there were more male hatchlings. These findings suggest that both genes and environmental temperature play a role in sex determination in this lizard species. The experiment also found that the mortality rate of embryonic lizards was approximately the same for both males and females.
The findings of this experiment are relevant to understanding the evolutionary biology of reptiles, as well as to conservation efforts for threatened or endangered species. For example, scientists studying endangered reptile populations may use temperature manipulation as a tool to encourage the production of males or females, depending on which sex is more needed to maintain a healthy population.
Overall, this experiment highlights the complex interplay between genetic and environmental factors in determining an organism's traits and characteristics, including its sex.
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sterols are precursors for vitamin d and cholesterol true or false
Answers
Sterols are precursors for vitamin D and cholesterol is a true statement. Sterols are a kind of fat found in plants and animals that have a steroid-like chemical structure and have been linked to human health benefits.
They are also known as steroid alcohols, and they are an essential part of the body's cell membranes. A precursor is a substance that the body converts into another chemical or compound. Precursors are intermediaries in the body's metabolic processes, converting one substance into another.
The statement Sterols are precursors for vitamin D and cholesterol is true. 7-dehydrocholesterol, which is derived from cholesterol, is a precursor to vitamin D3, which is then converted into calcitriol, the active form of vitamin D that is used by the body.
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b - black b- brown p - bb x bb f1 - ? what is the phenotypic ratio of f1?
Answers
The phenotypic ratio of the F1 generation in this scenario would be 100% black.
Since the parent organisms have genotypes of "P - bb x bb", where both parents have the brown allele (bb), the offspring of the F1 generation will also inherit the brown allele from both parents. Therefore, all the offspring in the F1 generation will have the genotype "bb" and exhibit the brown phenotype. As a result, the phenotypic ratio of the F1 generation would be 100% black, as there are no individuals with the black phenotype in this particular cross.
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when the intensity of an abiotic affect on a population does not increase with increased population density, it is then referred to as a(n) factor.
Answers
When the intensity of an abiotic affect on a population does not increase with increased population density, it is then referred to as a density-independent factor. Density-independent factors include abiotic factors such as weather events or natural disasters, and biotic factors such as predation or disease. These factors affect a population regardless of its density, whereas density-dependent factors such as competition for resources or territorial behavior are affected by the population density.
When the intensity of an abiotic effect on a population does not increase with increased population density, it is then referred to as a density-independent factor.
Explanation: Density-independent factors are abiotic factors that affect a population regardless of its density. These factors often include natural disasters, climate changes, or human activities, which can impact populations regardless of their size or density.
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You wake up in the morning and get out of bed. Does the floorfeel cold or warm on your bare feet? On the lines below, write asentence that compares how it feels to step on a bare floor and ona rug on a cold morning.
Answers
In hamsters, black fur (B) and white fur (W) are co-dominant. A scientist finds a record of offspring for a mated pair of hamaters
Answers
Answer:
bw x bb
Explanation:
hich of the following statements is TRUE regarding HIV transmission and infection? A. Infants born with HIV appear ill at birth. B. The risk of HIV transmission during oral sex increases if a person has brushed his or teeth or flossed just before or after oral sex. C. The rate of HIV infection is higher among whites than among African Americans. D. HIV-positive mothers can breastfeed their infants without risk of HIV transmission.
Answers
Option D is true. HIV-positive mothers can breastfeed their infants without risk of HIV transmission.
Because of improvements in medical understanding and treatments, this assertion is true. The risk of mother-to-child HIV transmission can be considerably decreased with the right medical care and treatment, including antiretroviral therapy.
The World Health Organization (WHO) offers recommendations for HIV-positive mothers to breastfeed their infants while taking care to reduce transmission risk in some situations, such as in resource-constrained locations where safe alternatives are not accessible.
Infants with HIV may or may not show symptoms when they are born. Some infants may not immediately exhibit symptoms of sickness, and the way these symptoms reveal themselves can differ.
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Complete question
Which of the following statements is TRUE regarding HIV transmission and infection?
A. Infants born with HIV appear ill at birth.
B. The risk of HIV transmission during oral sex increases if a person has brushed his or teeth or flossed just before or after oral sex.
C. The rate of HIV infection is higher among whites than among African Americans.
D. HIV-positive mothers can breastfeed their infants without risk of HIV transmission.
Explain the significance of the G,G_2, and M checkpoints and the go-ahead signals involved in the cell cycle control system.
Answers
The G1, G2, and M checkpoints play significant roles in the cell cycle control system. These checkpoints ensure that the cell cycle proceeds accurately, preventing errors and abnormalities in cell division.
1. G1 Checkpoint: The G1 checkpoint, also known as the restriction point, monitors the cell's environment and internal conditions before entering the S phase.
It ensures that the cell has enough nutrients and energy to support DNA replication and division. At this checkpoint, the cell checks for DNA damage and repairs it if possible. If the cell passes this checkpoint, it commits to completing the cell cycle.
2. G2 Checkpoint: The G2 checkpoint occurs after DNA replication during the S phase and before entering the M phase. It checks whether DNA replication was successful and ensures that all DNA damage has been repaired.
The G2 checkpoint also verifies that the cell has enough resources to proceed with cell division. If any abnormalities or damage are detected, the cell cycle is halted to prevent the transmission of errors to daughter cells.
3. M Checkpoint: The M checkpoint, also known as the spindle checkpoint, takes place during metaphase of mitosis. It ensures that all chromosomes are properly aligned at the metaphase plate and attached to the spindle fibers.
If any errors or misalignments are detected, the checkpoint delays the progression of cell division until the issues are resolved. Once all chromosomes are properly aligned and attached, the checkpoint gives the go-ahead signal to proceed with anaphase.
Go-Ahead Signals: Go-ahead signals are necessary to proceed through the cell cycle checkpoints. These signals are triggered by the completion of essential processes, such as DNA replication or proper alignment of chromosomes. For example, cyclin-dependent kinases (CDKs) and cyclins play a crucial role in regulating the cell cycle.
The formation of specific CDK-cyclin complexes promotes the progression of the cell cycle by phosphorylating target proteins involved in cell division. These go-ahead signals ensure that each phase of the cell cycle is completed successfully before advancing to the next.
In summary, the G1, G2, and M checkpoints are crucial for maintaining the accuracy and integrity of cell division. They ensure that DNA replication is complete, DNA damage is repaired, and chromosomes are properly aligned before proceeding.
Go-ahead signals, such as CDK-cyclin complexes, play a role in initiating the progression of the cell cycle. These checkpoints and signals work together to ensure the proper regulation of the cell cycle and the generation of healthy daughter cells.
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What is the difference between a predator and a parasite?
a) A predator has a lengthy relationship with its prey
b) A parasite does not immediately kill its host.
c) A predator does not immediately kill its prey.
d) A parasite has a brief relationship with its host.
Answers
The correct answer is b). A parasite does not immediately kill its host.
What is the difference between a predator and a parasite?
Predators are species that obtain energy by stealing it from other organisms, just like parasites do. Consequently, we have a relationship where one creature (the predator) benefits while the other organism suffers (the prey).
Because they only consume resources from one host, parasites differ from predators in that they do not consume a large number of prey. Schistosoma mansoni, a trematode parasite, is an excellent illustration of this. One human host is all that an adult schistosome parasite needs to survive. It won't ever slither out and infect another person.
Hence, the correct option b.
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When must the process of DNA replication in a cell be complete?
options in picture
Answers
Answer:
The First option
Explanation:
PLEASE HELP ASAP ILL GIVE BRAINIEST
Do you place an item in the autoclave before or after washing it?
Answers
Answer:
Wash it first to remove obvious soil or residue.
Then put it into the autoclave to sterilize it.
the universality of dna as the genetic material shows descent from a common ancestor for all of life. this is an example of
Answers
The universality of DNA as genetic material indicates descent from a common ancestor for all life. This is an example of molecular biology.
What is molecular biology?Molecular biology is a branch of biology that is concerned with the study of life at the molecular level. This includes the study of molecular interactions in living things and their influences, especially the interactions of various cell systems, including the interactions of DNA, RNA, and protein synthesis and the regulation of these interactions. This field overlaps with other fields of biology (and chemistry), especially genetics and biochemistry.
How does DNA prove descent from a common ancestor?These shared genes trace the ancestry they shared but not with bacteria. Because genes change over time, the more similar the DNA of two organisms, the younger their ancestor. Observations of anatomy, fossils, and embryonic development are all rooted in DNA.
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the total dinner bill at a buffet comes out to $1,240 for 62 people. about how much the same number of digits
Answers
Answer:
20$
Explanation:
hurry50points
Explain the theory of plate tectonics and how they have changed Earth’s surface over time. Include the role of plate tectonics in the creation of landforms. suort awser
Answers
Answer:
The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earth's mantle below the earth crust...Explanation:
The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earth's mantle below the crust. Earthquakes and volcanoes are the short-term results of this tectonic movement. The long-term result of plate tectonics is the movement of entire continents over millions of years... please marks me as brainliests for my effort....Please Help.
8) Chlorophyll gives plants their green color. Chlorophyll is produced only when plants are exposed to light, so plants kept in darkness have no chlorophyll and appear white. The best explanation for this is that...
A) darkness mutates the chlorophyl genes, causing them to produce a white color
B) chlorophyll is not needed by green plants at night
C) light is required for chlorophyll genes to be expressed
D) genetic information in cells is not influenced by the outside environment
Answers
Answer:
C
Explanation:
Lig is required for chloroform
Why do you think that carbon spends so much time in this place?
Answers
Answer:
b
Explanation:
ur momjabgdoajn Lahr o the. and dobby the
5. Why would a microbe evolve the ability to be motile? Why would a microbe evolve to permanently lose the ability to be motile? 6. What does it mean about the food available in its natural environment if a microbe evolved the ability to secrete amylase in its natural habitat? 7. What does it mean about the food available in its natural environment if a microbe evolved the ability to survive on citrate as a sole carbon source?
Answers
Microbes can evolve in response to a variety of selection pressures, such as changes in temperature, pH, salinity, nutrient availability, and predation. In response to these pressures, microbes can acquire new genes or modify existing ones through various mechanisms to develop different abilities.
5. A microbe may evolve the ability to be motile as a way to move towards nutrients or away from toxins in its environment. This can give it an advantage in finding resources and avoiding harmful substances.
On the other hand, a microbe may evolve to permanently lose its motility if it becomes more efficient to stay in one location and rely on other means of obtaining nutrients, such as through symbiosis or absorption.
6. If a microbe evolved the ability to secrete amylase in its natural habitat, it suggests that there is a significant amount of complex carbohydrates present in the environment.
Amylase is an enzyme that breaks down complex carbohydrates into simpler sugars that the microbe can then use as a source of energy. Therefore, the evolution of this ability indicates that the microbe has adapted to survive on a diet that is rich in complex carbohydrates.
7. If a microbe evolved the ability to survive on citrate as a sole carbon source, it suggests that there is limited availability of other carbon sources in its natural environment.
Citrate is a molecule that can be broken down into simpler compounds that the microbe can use as a source of carbon, which is essential for its growth and survival. Therefore, the evolution of this ability indicates that the microbe has adapted to survive in an environment where there is a scarcity of other carbon sources.
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only bones form fossils
true or false
quick pls !!