Question

Why does the blood returning to the heart have very little oxygen in it?

A)The heart is not pumping oxygen fast enough
B)The cells throughout the body used the oxygen.
C)The heart did not receive enough oxygen from the lungs
D)The lungs breathed out too much oxygen

Answer 1

B: The cells throughout the body used the oxygen.

Answer 2

I would say that the answer is B. I hope you have a good day!