Which is an example of a mutualistic relationship?

In the context of ecological interactions, mutualism is a relationship where two species benefit from each other. The correct answer illustrates this concept perfectly through the interaction between a flower and a bee. The flower provides nectar, which serves as a food source for the bee, while the bee, in turn, assists the flower with pollination, facilitating its reproduction. This mutual dependence enhances the survival and fitness of both species involved.

Other choices depict different types of interactions. The relationship between a lion and a zebra is an example of predation, where one organism benefits at the expense of another. The interaction of a tree absorbing carbon dioxide describes a process essential for survival but does not involve mutual benefits from two different species. Lastly, a predator consuming its prey is again a demonstration of a predator-prey relationship, where the predator benefits while the prey is harmed. Hence, the flower and bee interaction uniquely illustrates mutualism, making it the correct answer.