During gas exchange, which substance moves from the alveoli into the blood?

a. nitrogen
b. water
c. carbon dioxide
d. oxygen

The exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.

Hope this helped

it is either C or D but i really dont know but good luck

Hey there,newtons 2nd law of motion is 'and i quote' : "the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object."~jurgen