Fact 1: Harming an animal species causes that animal 's population to decrease.

Fact 2: Studies of island populations have shown that extinction rates increase as area decreases.

Given the two facts above, answer the question "What to an animal species causes increase in extinction rates?" with the following options: 
- promoting
 - Pesticides
 - viruses
 - saving
 - harming
 - helping
 - wind
 - chickenpox


 

     harming    