Question

1. which is an example of commensalism?

fleas benefit from living on dogs, but they hurt the dogs.
birds benefit from living on rhinoceroses, and they benefit the rhinoceroses.
barnacles benefit from living on whales, and they do not hurt the whales.
hawks benefit from eating snakes, but they do not benefit the snakes.

Explanation:

Commensalism is a symbiotic - relationship where one organism benefits and the other is neither helped nor harmed. Barnacles on whales fit this.

Answer:

B. Barnacles benefit from living on whales, and they do not hurt the whales.