water -> grass -> fox -> hawk sun -> rabbit -> moose -> wolf grass -> spider -> mouse -> rabbit dead mouse -> flies -> frog -> snake
I gave my students this multiple choice question: Which of the following is a valid food chain?

Only one answer is correct among these 4 choices:
- water -> grass -> fox -> hawk
- sun -> rabbit -> moose -> wolf
- grass -> spider -> mouse -> rabbit
- dead mouse -> flies -> frog -> snake

Could you tell me which one is correct?

dead mouse -> flies -> frog -> snake