You are presented with the question "DDT protects plants by doing what?" and the following answer choices: 
- to stay warm
 - energy barrier
 - eating insects
 - killing crops
 - activation energy
 - killing insects
 - killing everything
 - it needs them

Now knowing that apesticide is used for protecting plants by killing insects and pesticides such as DDT are also of concern, choose the best answer.


 

      killing insects   