Veins take blood back to the heart. Which gas would be most abundant in a vein that takes blood from muscle cells in the arm back to the heart? carbon dioxide

oxygen

nitrogen

hydrogen

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

hammurabi rulers

good lesson

i don't know. if i were you, i would search it up online : d