Answer:
Red blood
Explanation:
The bluish color of veins is only an optical illusion. Blue light does not penetrate as far into tissue as red light. If the blood vessel is sufficiently deep, your eyes see more blue than red reflected light due to the blood's partial absorption of red wavelengths.
Answer:
cells are regulated by their oxygen uptake
Your answer would be D. Carbon monoxide. Everything else pollutes the water
