You are presented with the question "What has a negative impact on the population size of a species?" and the following answer choices: 
- Pesticides
 - influenza
 - steroids
 - liver cancer
 - cloudy and rainy weather
 - massive damage
 - cosmetic testing
 - killing insects

Now knowing that harming an animal species has a negative impact on the population size of that species and animals are harmed because of cosmetic testing, choose the best answer.


 

       cosmetic testing  