Q: What do trees release during the day but not at night?
Options:
- (A) Energy
- (B) water
- (C) He
- (D) Ce
- (E) chemicals
- (F) Energy.
- (G) heat
- (H) oxygen
Let's think step by step below.

user
Plants release oxygen during the day but not during the night. All plants are trees. Trees release oxygen during the day but not at night.
Thus, the answer is (H).
assistant