Water (H2O) takes up more than 60% of the body thus the answer is C
First answer is , as the work of ventricle is to push blood to he whole body , so it has to be strong or it can not pump blood to head to the toe !
as in frog (an amphibian ) it has only three chambers as two artia and one ventricle, so the oxygenated blood from left artia and deoxygenated blood from right , combines and thus partial oxygenated blood is circulated !
That would be A.
Cells have specific receptors for different hormones that allow the intake of them.
ANSWER
D. a star hope this helps :)
