You will be given a definition of a task first, then some input of the task.
In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Question: When we look at animals when their population gets bigger what happens to each animal? 
 Answer: grow bigger
Output:
In exponential growth as the population size increases, the growth rate also increases.