Question

How can a change to the population of one species affect an entire ecosystem​

Answer 1

A decrease or increase of a certain population can affect the food chain of an ecosystem

Lets say bugs start dying at a rapid rate in an swamp ecosystem

The frog population would then decrease because they have no bugs to eat

The frog’s predators would then decrease because of the number of frogs to eat are decreasing.

So on and so forth.

Hope this helps!