Cactus wren and cholla cactus. What is the advantage and disadvantage of this relationship to each organism

The Cactus wren and Cholla cactus have a commensalism relationship in which the only one with benefits is the cactus wren and neither of them has a disadvantage.

Explanation:

First of all, this relationship is very special. The cactus wren nests in the chollas. While the chollas don't harm them for doing so, in contrast, they provided protection for their eggs from predators. The Chollas don't receive any benefit and also no harm. Therefore, the only one that benefits here is the Cactus Wren. However, they don't damage or threaten the Chollas' lives.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

genetic variation will increase because of a new habitat and food source.

explanation: