Which example best describes a reflex action?
A.
coughing when the throat is irritated
B.
eating food when hungry
C.
going for a walk outside
D.
bending down to lift a heavy object

In the sense of alternation of generations, a mature pine seed contains the products of two generations: the sporophyte generation and the gametophyte generation.

The sporophyte generation is the dominant, visible phase of the pine life cycle, and it produces the mature pine tree that we commonly recognize. However, tiny structures called cones contain the gametophyte generation within the sporophyte, which is much smaller and less visible.

The male gametophyte, or pollen, is produced in small microsporangia, while the female gametophyte, or ovule, is produced in larger structures called megasporangia. When a pollen grain lands on an ovule, it germinates and produces a tiny, dependent gametophyte that eventually develops into the mature pine seed.

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Answer:

Mass extinctions happen because of climate change, asteroid impacts, massive volcanic eruptions or a combination of these causes. One famous mass extinction event is the one that lead to the extinction of dinosaurs, 65 million years ago.

Explanation:

Cardiorespiratory endurance is defined as the ability of the body to perform prolonged, large-muscle, dynamic exercise at moderate to high levels of intensity.

An essential measure of physical health is cardiorespiratory endurance, which is the capacity of the heart and lungs to supply oxygen-rich blood to working muscles throughout prolonged physical exercise. Maximum oxygen uptake (VO2max), which is not a useful metric for usage in real-life situations, is commonly used to test cardiorespiratory endurance in the laboratory. As it is relatively challenging to measure oxygen consumption directly, we can calculate cardiorespiratory endurance using heart rate. In this study, we suggested a fuzzy system based on the heart rate of humans to provide an efficient cardiorespiratory endurance training program and the assessment of cardiorespiratory endurance levels.

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Answer: Thus, gravity itself is not “an example of a scientific law”. It’s just a term. Newton’s Law of Universal Gravitation gives us a mathematical description of gravity’s properties, and Einstein’s Theory of General Relativity gives us an explanation for why we perceive the force that Newton mathematically described.

Answer:

A

Explanation:

Answer: Girls need to inherit two affected chromosomes to develop the disease, and it may also happen that the affected chromosome is inactivated in the eye (if it has only one)

Explanation:

Norrie's disease is an inherited eye disorder affecting males, which is characterized by abnormal or immature development of the retina (light-sensitive nerve tissue lining the back of the eye) and possible deterioration of the iris (colored part of the eye) and eyeballs. X-linked recessive inheritance is one of the ways in which a genetic trait or condition is passed from parent to child when there are mutations in a gene on the X chromosome from either the father or the mother. Females possess two X chromosomes, while males possess one X and one Y chromosome. In males, the presence of a mutation on the X chromosome causes the disease, since it is the only X they possess. In females, both X chromosomes need to be affected if it is a recessive condition.

So, the disease is inherited in an X-linked recessive manner, which means that almost all affected individuals are male. However, the sons of affected males will not have the mutation since they only inherit the Y chromosome, while all their daughters will be genetic carriers of the mutation because they inherit the affected X chromosome, although without clinical symptoms but being carriers. On the other hand, the mother will pass one of her two X chromosomes (which may or may not be affected) randomly to both her male and female offspring (if they are male, they will be affected and if they are female they will be carriers unless they also inherit an X chromosome from their father). So the only way for females to develop the disease is for their two copies of the gene to be mutated if both parents have the mutation.

But female carriers could be affected by inactivation of their X chromosome with the correct sequence. X chromosome inactivation is a random process that happens separately in individual cells during embryonic development. That is, one cell may inactivate the paternal X chromosome, while others may inactivate the maternal X chromosome. This is because a dosage compensation is necessary, since the Y chromosome in males is not homologous to the X, it does not have the same genes, so if females would express both X chromosomes, they would have twice as many genes as a male.  All the descendant cells of each of these original cells will maintain the same pattern of X chromosome inactivation.

In females, one X chromosome is inactivated in each tissue in an arbitrary manner. Then, in addition to having to inherit two affected chromosomes, it may also happen that the affected chromosome is inactivated in the eye (if it has only one).

Answer:

true

Explanation:

I cant tell if yoire saying t or f as the answers. but I am quite sure this woukd be true because having the goal of phsycial fitness whike being active woukd be considered excercise

Explanation:

Muscular Strength

Muscular endurance

Flexibility

Body Composition

Answer:

  I believe it would be D The evidence the speech presents

Explanation:

  The context of a speech refers to the purpose, which makes me think it would best be described as the evidence since evidence is used to prove your purpose.  

According to the results, mice whose soil color matches theirs are attacked more frequently than mice whose dirt does not. According to this theory, mice's fur color is an evolutionary adaptation because they have a higher chance of surviving and procreating if they can hide from predators.

This data supports the hypothesis that fur color is an adaptation in mice because it suggests that mice with fur that matches the color of the soil are less likely to be attacked by predators. This is because they are better able to blend in and avoid detection.

Mice that have fur that does not match the color of the soil are more likely to be seen by predators and are therefore at a greater risk of being attacked. This increased likelihood of survival and reproduction in mice with fur that matches the color of the soil is consistent with the idea that fur color is an adaptation in mice.

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Answer:

can you explain pls !!!!!?

Answer:tRNA (translate rna) and mRNA(messenger rna).

Explanation:

Answer:

eukaryotic because they have a nucleus in their cell.

Explanation:

Answer:

Explanation:

Let's start with the formula for density.

Density = mass / volume

The mass is a constant. So it has no effect on the answer. Call it 10 grams in both cases.

The volume of the small object is 10 cc.

The volume of the larger object is 30 cc

Density of the small object = 10 grams / 10 cc = 1 gram / cc

Density of the larger object = 10 grams / 30cc = 1/3 gram / cc

Conclusion.

If the mass is held constant, the higher the volume, the less the density.

Every so often Brainly publishes a fun fact. The fact is "Saturn would float in a bathtub filled willed with water." The bigger the volume, the smaller the density.

A mutated gene that transforms a normal cell into a tumor cell is called an oncogene. Oncogenes are derived from normal genes, called proto-oncogenes, which play essential roles in cell growth, division, and differentiation.

However, when mutations or other genetic alterations occur, proto-oncogenes can become oncogenes, leading to uncontrolled cell growth and potentially the development of cancer.

The process of normal cells transforming into tumor cells is called carcinogenesis. Mutations can be caused by various factors, such as exposure to carcinogens, radiation, viruses, or inherited genetic defects. These mutations may lead to the activation of oncogenes or the inactivation of tumor suppressor genes, which normally function to prevent excessive cell growth and maintain genomic stability.

The activation of oncogenes can result in continuous cell proliferation, evasion of cell death, increased angiogenesis (formation of new blood vessels), and metastasis (the spread of cancer cells to other parts of the body). Furthermore, oncogenes can contribute to the development of a tumor microenvironment that supports the growth and survival of cancer cells.

Cancer therapies often target oncogenes and the signaling pathways they control to stop the growth and spread of tumor cells. By understanding the role of oncogenes in carcinogenesis, researchers continue to develop new treatments and strategies to combat cancer and improve patient outcomes.

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Answer:

Menstruation is a time in a young-women's life where she starts to bleed from her ding-dong. This happens because when an egg in her uterus is not fertilized by a sperm, the lining of the uterus breaks itself down and passes out through the uterus opening, including the egg.

Answer:

The independent variable is one that is controlled to corroborate its effects or the relationship causes consequence with a phenomenon in relation to the dependent variable.

Explanation:

In an epidemiological study, or a research based on a hypothesis, there are different variables.

Variables are those phenomena that vary over time and can be quantifiable over time.

The quantification of the variables must be through indexes or analysis, and these in turn must confer data reliability.

On the other hand, there are two types of variables, dependent and independent, homogeneous or non-homogeneous (that is, they occur in one individual or in many at the same time) and if they are reasonable or not in the face of a given investigation.

If the variable that is chosen in an investigation is not reasonable or homogeneous, it will never become independent or dependent since it will not be good to take it into account or count it during the investigation.

In this case, the possible variables could be: the type of music, different levels of hearing by the workers, the type of work they do when listening to music, the volume of the music in which it is heard.

Answer:

i think its true

Explanation:

The big idea of the Flame Test lab is to demonstrate the characteristic colors emitted by different metal ions when heated in a flame.

The Flame Test lab is a common chemistry experiment used to identify and distinguish between different metal ions based on the color of the flames they produce when heated.

The characteristic colors observed in the flame result from the excitation of electrons in the metal ions to higher energy levels, followed by their subsequent relaxation back to lower energy levels, accompanied by the emission of light.

The colors emitted by different metal ions are unique and can be used to identify the presence of specific metals in a sample. The Flame Test lab provides a visual demonstration of the relationship between the colors observed in the flame and the identity of the metal ions present in a sample, and it is widely used in chemistry education and analytical chemistry to teach about the properties of different metal ions and their spectroscopic characteristics.

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Answer:

Cystic fibrosis is caused by a change, or mutation, in a gene called CFTR (cystic fibrosis transmembrane conductance regulator). This gene controls the flow of salt and fluids in and out of your cells. If the CFTR gene doesn't work the way it should, a sticky mucus builds up in your body.

Answer:

Cystic fibrosis is caused by a change, or mutation, in a gene called CFTR (cystic fibrosis transmembrane conductance regulator). This gene controls the flow of salt and fluids in and out of your cells. If the CFTR gene doesn't work the way it should, a sticky mucus builds up in your body.

Answer:

What?

Explanation:

Answer:

ACU - Thr

Explanation:

apesc

Answer:

The answer would be Thr

Explanation:

A.P.E.X

Answer:

DNA is a dynamic and adaptable molecule. As such, the nucleotide sequences found within it are subject to change as the result of a phenomenon called mutation. Depending on how a particular mutation modifies an organism's genetic makeup, it can prove harmless, helpful, or even hurtful.

Explanation:

Answer:

I believe it would be D

Explanation:

Why is temperature, pH, and dissolved oxygen

important to water quality?

Temperature – Temperature affects aquatic organisms in a variety of

ways. The body temperature of most aquatic organisms is the same as

the surrounding water and fluctuates with the water temperature.

Most aquatic organisms are adapted to live in a narrow temperature

range and they die when the temperature becomes too low or too

high. Temperature affects their metabolism, reproduction and

emergence. Temperature also affects the rate of photosynthesis of

aquatic plants, the base of the aquatic food web. Pollutants can

become more toxic at higher temperatures. The amount of dissolved

oxygen becomes lower as the water becomes warmer. Temperature is

measured in degrees Fahrenheit or Celsius (Centigrade).

pH – pH is the measure of hydrogen ions, or acidity, in the water.

Water has hydrogen ions and hydroxyl ions. When there are equal

numbers of both, the water is neutral. As the hydrogen ions increase,

the water becomes more acidic; as the hydroxyl ions increase, the

water becomes more basic. pH is measured on a logarithmic scale of

0 – 14: 7 is neutral; below 7 is acidic; above 7 is basic. Most aquatic

organisms have a narrow pH tolerance range of 6.5 – 8.5. Acidic

waters can cause toxic heavy metals to be released into the water.

Acid rain and mining operations can lower the pH of water bodies.

Dissolved Oxygen – Most aquatic organisms need oxygen to survive.

Dissolved oxygen is the oxygen present in water available to aquatic

organisms. It is not the oxygen that is part of the water molecule but

rather oxygen gas. Oxygen enters the water from the air through rain,

turbulence and wind, and through the photosynthesis of aquatic

plants. Organisms absorb the oxygen through structures such as gills

or their skin. Waters with higher dissolved oxygen have ecosystems

that are generally more diverse and stable. Decomposition of organic

material is a major cause of low dissolved oxygen resulting in fewer

species. Dissolved oxygen is measured in parts per million (ppm) or

milligrams per liter (mg/L).

The organism that does not have a nucleus is Prokaryotes.

the correct answer is ratio 1:(a t)/(g c) is constant for double-standard DNA, regardless of the species.

The ratio that is expected to be constant for double-stranded DNA, regardless of the species is Ratio 1.

Chargaff's rule is a basic principle in genetics that states that within a double-stranded DNA molecule, cytosine and guanine are present in equal proportions, as are adenine and thymine.

This is sometimes referred to as the "base-pairing rule," as each base (cytosine, guanine, adenine, or thymine) forms a "pair" with another specific base in the opposite strand of DNA.

A will be opposite T, and C will be opposite G.

The ratio of the bases A-T and G-C in double-stranded DNA is expected to be constant, regardless of the species.

Ratio 1: (A T)/(G C) is the ratio that is expected to be constant for double-stranded DNA, regardless of the species. The bases A-T and G-C pair up in DNA because of hydrogen bonding.

The ratio of base pairs is always equal. This is also known as Chargaff's rule.

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Answer:

No

Explanation:

Cu2(CO3)(OH)2 - there are other elements present other than just copper

In a scenario where four identical cells are placed in four different liquids then the cells which would take in water and swell  are cells X and Y and is denoted as option C.

This is referred to as the movement of solvent molecules through a semipermeable membrane from a region of lower solute concentration to that of a higher solute concentration.

In a scenario where there is a decrease in the solvent molecules then it will be less salty and have a lower concentration of water which may make it shrink and is referred to as plasmolysis.

In cells in which there is an increase in the solvent molecules then it will be salty and have a higher concentration of water which is responsible for it swelling and is therefore the reason why cells X and Y was chosen as the correct choice.

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The full question is:

A student places four identical cells into four different liquids.

Cell Description of Liquid

Answer:

B.

Explanation:

When we exercise we inhale more O2 because of all the physical activity we are doing,

I hope it helps! Have a great day!

Muffin ^^