They would increase in number. They would find a new food source. They would become prey to other animals. They would compete for a limited food source.
I gave my students this multiple choice question: Clams, oysters, and mussels eat plankton filtered from water. How would clams, oysters, and mussels most likely be affected if the amount of plankton in a large body of water was significantly reduced?

Only one answer is correct among these 4 choices:
- They would increase in number.
- They would find a new food source.
- They would become prey to other animals.
- They would compete for a limited food source.

Could you tell me which one is correct?

They would compete for a limited food source.