Fact 1: Air pollution harms the respiratory and circulatory systems.

Fact 2: Air pollution is caused by lots of different pollutants.

Given the two facts above, answer the question "What systems are pollutants bad for?" with the following options: 
- destroying life
 - classification system
 - an organism's body
 - respiratory and circulatory
 - animal habitats
 - ambulatory systems
 - social security system
 - the environment


 

    respiratory and circulatory     