pick from the following. 1). It expands. 2). harm them. 3). it can change species. 4). Move to another area. 5). it can eat more. 6). it can go extinct. 7). it can fluctuate. 8). Plant growth is reduced.

Fact 1: Migration is a type of movement that changes population size. Fact 2: Population viability Population sizes are under constant fluctuation. Given the two facts above, what can happen to a population when animals begin to migrate?
Answer:
7).