Question

barnacles create home sites by attaching themselves to whales. this neither harms nor benefits the whales. what kind of relationship is this? parasitism mutualism commensalism

Explanation:

Commensalism is a type of symbiotic relationship where one organism benefits while the other is neither helped nor harmed. In this case, barnacles benefit by getting a home site (attachment to whales), and whales are neither harmed nor benefited. Parasitism is when one organism (parasite) benefits at the expense of the other (host, which is harmed). Mutualism is when both organisms benefit from the relationship.

Answer:

Commensalism