Fact 1: Plants release oxygen during the day but not during the night.

Fact 2: Algae produce oxygen during the day through photosynthesis.

Given the two facts above, answer the question "Plants do what during the day but not during the night?" with the following options: 
- synthesize
 - absorb
 - photosynthesize
 - produce light
 - hydrate their cells
 - evaporation
 - plant
 - reproduce


 

   photosynthesize      