Think about a marine ecosystem such as an ocean. There are many interactions between living things within this ecosystem.
Marine biologists study the population of the plants and animals in this ecosystem when they notice a change.
Suppose a predator population suddenly decreased even though the prey population stayed the same. Besides disease, what could explain this change? Circle all that apply.
A) The predator had its own predator whose population increased.
B) The population of producers in the ecosystem died out.
C) The population of prey stayed the same.
D) A competing predator entered the ecosystem and is getting to the prey first, leaving the original predator without resources.
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