3. describe two ways that humans influence the cycling of matter in ecosystems.

water, carbon and nitrogen

Explanation:

All of the materials an organism takes in are returned to the ecosystem, while the organism lives or after it dies. The movement of matter through the living and nonliving parts of an ecosystem is a continuous process, a cycle. ... Three of the most important cycles in ecosystems involve water, carbon, and nitrogen.

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.