How do swimmers mess up the nitrogen and phosphorous cycles?

Humans have greatly influenced the phosphorus cycle. It has been mined by them, converted into fertilizers, and transported around the world. These activities have resulted in run offs from farm water into pools and lakes which then turn phosphorous rich.

Explanation:

it is a learned trait

explanation:

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms