Answer:
During exercise, your heart typically beats faster so that more blood gets out to your body. Your heart can also increase its stroke volume by pumping more forcefully or increasing the amount of blood that fills the left ventricle before it pumps.
Explanation:
Four abiotic factors in a prairie ecosystem would be soil, climate/temperature, water, and oxygen. Hope this helps!
The answer to the question is "4 chromosomes".
The genes that code for a hemoglobin is found on 4 chromosomes. Two of this code is for the alpha globin while the remaining two genes that are code is for the beta globin.
It is c I believe cause the human cells can’t make their own food like plants do when they photosynthesis
