a flea living on a dog a bee pollinating a flower a tapeworm living inside an animal a mosquito biting a person
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which interaction benefits both organisms?
Possibilities:
- a flea living on a dog
- a bee pollinating a flower
- a tapeworm living inside an animal
- a mosquito biting a person

a bee pollinating a flower