You are presented with the question "What can decrease in an environment, and may cause animals to leave?" and the following answer choices: 
- essentials of life
 - competition
 - wind speed
 - living things
 - single-celled organisms
 - deforestation
 - biodiversity
 - rock content

Now knowing that if the amount of available food and water decreases in an environment then animals may leave that environment to find food and water and food, water and air are the essentials of life on earth, choose the best answer.


 

 essentials of life        