Given the task definition and input, reply with output. 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: If there are a lot of wolves the deer population will 
 Answer: decrease

An increase in predators, the emergence of a new disease, or the loss of habitat are just three possible problems that will decrease a population.