Question

which factor best explains why an ecosystem cannot support unlimited population growth?niche competitionkeystone species interactionsevolutionary historylimiting factors such as food, space, and water

Explanation:

Limiting factors like food, space, and water restrict population growth as they are finite resources in an ecosystem. Niche competition and keystone species interactions are more about species - level dynamics rather than overall population limits. Evolutionary history relates to species' development, not immediate population support.

Answer:

Limiting factors such as food, space, and water