You are presented with the question "What systems are pollutants bad for?" and the following answer choices: 
- destroying life
 - classification system
 - an organism's body
 - respiratory and circulatory
 - animal habitats
 - ambulatory systems
 - social security system
 - the environment

Now knowing that air pollution harms the respiratory and circulatory systems and air pollution is caused by lots of different pollutants, choose the best answer.


 

    respiratory and circulatory     