Apesticide is used for protecting plants by killing insects, and pesticide use requires disposal of either excess pesticides or empty pesticide containers. Given these facts, what does something used for protecting plants by killing insects require among the following options:
- electricity
 - hydrogen and oxygen
 - organic molecules
 - food and shelter
 - important habitats
 - Special disposal
 - chemical messengers
 - deoxyribonucleic acid


 

      Special disposal   