Which statements explain the gas exchange that happens at the alveoli?

a) Carbon dioxide moves from the blood to the air in the

alveoli.

b) the capillaries that surround the alveoli exchange both carbon dioxide and oxygen.

c) oxygen is absorbed by the blood in the capillaries that surround the alveoli.

they dont have any evidence

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.