Keystone species have a massive impact in their ecosystems. Which of the following is not a factor that is impacted?

B. decreasing the amount of rainfall in an ecosystem

Keystone species primarily impact their ecosystems by maintaining the flow of energy, providing food sources for predators, and engaging in symbiotic relationships with other animals. However, the amount of rainfall in an ecosystem is generally influenced by larger climatic and geographic factors rather than directly by the presence or absence of a keystone species.