Fact 1: Apesticide is used for protecting plants by killing insects.

Fact 2: Pesticides such as DDT are also of concern.

Given the two facts above, answer the question "DDT protects plants by doing what?" with the following options: 
- to stay warm
 - energy barrier
 - eating insects
 - killing crops
 - activation energy
 - killing insects
 - killing everything
 - it needs them


 

      killing insects   