Fact 1: Using a car causes pollution.

Fact 2: Animals are killed everyday because of pollution.

Given the two facts above, answer the question "What kills animals every day?" with the following options: 
- hyperthyroidism
 - drinking clean water
 - humans
 - agriculture
 - eating nutritious food
 - sitting inside
 - using a car
 - electricity


 

       using a car  