Question

a bird building a nest in a tree without harming the tree is an example of:commensalismparasitismmutualismcompetition

Explanation:

• Commensalism: One organism benefits while the other is neither helped nor harmed. Here, the bird benefits (has a nest) and the tree is unharmed.
• Parasitism: One organism (parasite) benefits at the expense of the other (host). But the tree is not harmed here.
• Mutualism: Both organisms benefit. The tree gets no benefit in this case.
• Competition: Organisms compete for resources. That's not the case here.

Answer:

Commensalism