Fact 1: Amold spore has a negative impact on the respiratory system. Fact 2: Another name for the breathing tree is the respiratory system. Given the two facts above, what do mold spores make it hard to do?

Options:
[I] clean house.
[II] motility.
[III] kill them.
[IV] breathe.
[V] reproduce.
[VI] eat bread.
[VII] play outside.
[VIII] survive.
The answer is:
[IV]