Question

level 5
q3
plants made the oxygen in the air
animals use to breath by

a. splitting apart water molecules
b. splitting apart carbon dioxide
c. attaching water together
d. attaching oxygen together

○ a. splitting apart water molecules
○ b. splitting apart carbon dioxide
○ c. attaching water together
○ d. attaching oxygen together

Explanation:

In photosynthesis, plants produce oxygen by splitting water molecules ($\ce{H_2O}$) during the light - dependent reactions. Carbon dioxide is used to form glucose, not to produce oxygen. Attaching water together or attaching oxygen together is not how oxygen is produced in photosynthesis. So the correct option is A.

Answer:

A. Splitting apart water molecules