Harming an animal species causes that animal 's population to decrease, and today, the pink flamingo is included on the endangered species list. Given these facts, what causes pink flamingos' population to decrease among the following options:
- replenishing their habitats
 - drought
 - harming them
 - hypothyroidism
 - helping them
 - influenza
 - feeding them
 - Pesticides


 

   harming them      