Possible answers:
[I] health
[II] humans
[III] the environment
[IV] circulatory
[V] people
[VI] bones
[VII] lymphatic
[VIII] cell wall
Q: Fact 1: Air pollution harms the respiratory and circulatory systems. Fact 2: Air pollutants are inhaled. Given the two facts above, what system does inhaled pollution harm?
A:
[IV]