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

Fact 2: Oxygen from the air is needed by the body in order to live.

Given the two facts above, answer the question "What do plants do during the day but not during the night?" with the following options: 
- It helps them survive
 - Help the body to live
 - preventing heat transfer
 - by making heat
 - Generating heat
 - converting electricity to heat
 - Release energy
 - adding heat


 

  Help the body to live       