a flea living on a dog a bee pollinating a flower a tapeworm living inside an animal a mosquito biting a person
I gave my students this multiple choice question: Which interaction benefits both organisms?

Only one answer is correct among these 4 choices:
- a flea living on a dog
- a bee pollinating a flower
- a tapeworm living inside an animal
- a mosquito biting a person

Could you tell me which one is correct?

a bee pollinating a flower