Please help! A. Why would the saguaro be considered a keystone species in its ecosystem?

B. Name examples of predation, mutualism, and commensalism that involve the saguaro.

C. What is one way a desert ecosystem would be affected if environmental changes were to cause a decrease in the saguaro population?

Explanation:

A. The SAGUARO fruits ripen during the peak of drought in the early summer and are about the only moist food source for many birds, mammals, and insects during this part of the year. Saguaros make excellent nesting places for many birds.

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds

what is the statement?