Answer is A
carrying blood from the body to the heart.
Answer:
Chromosomes help ensure that DNA is replicated and distributed appropriately during cell division.
Explanation:
The atomic number is the number of protons an element has, protons are positively charged and electrons are negatively charged. All elements have no charge so the number of electrons will always equal the number of protons for an element so there are 6 electrons.
The most important variable to control in this experiment the type of bicycle tyre.
<h3>What is an experiment?</h3>
An experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.
According to this question, Dan and Dawn wants to know if there is any difference between the mileage expected from bicycle tires from two different manufacturers.
Dan, then, conduct an experiment by putting one brand on his bike and Dawn will put the other brand on her bike.
In this experiment, the independent variable is the different mileage from different manufacturers. This means that to make this experiment a controlled one, all other variables must be kept constant.
Therefore, the most important variable to control in this experiment the type of bicycle tyre because Dan and Dawn must ensure that they use the same type of bicycle tyre.
Learn more about experiments at: brainly.com/question/11256472
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Answer:
Likely an issue with the mitral valve.
Explanation:
If I read this correctly, you are likely referring to mitral regurgitation, which is a process where your mitral value does not close tightly enough to stop the blood to flow into left atrium.
Normally, when the left ventricle is full, the mitral valve shuts to prevent blood blood from flowing backward into the atrium while the ventricle contracts, and this allows for blood to go to aorta and to body. According to question since the process is reversed, I am gonna go out on a limb and say mitral valve is likely the structure affected by this since and how I came to conclusion is all the explaintion I did earlier.