Biology

The correct answer is: B.A bee pollinating a flower.

This is an example of mutualism, a type of symbiotic relationship in which both organisms benefit. In this case, the bee benefits by collecting nectar (food) from the flower, and in the process, it helps the flower by transferring pollen, which assists in the plant's reproduction.

Let's briefly look at the other options:

A.A flea living on a dog

This is an example of parasitism, where the flea benefits by feeding on the dog's blood, but the dog is harmed because it loses blood and may experience discomfort or disease due to the flea infestation.