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

Fact 2: Today, the pink flamingo is included on the endangered species list.

Given the two facts above, answer the question "What causes pink flamingos' population to decrease?" with the following options: 
- replenishing their habitats
 - drought
 - harming them
 - hypothyroidism
 - helping them
 - influenza
 - feeding them
 - Pesticides


 

   harming them      