Question

what causes competition in an ecosystem?
a. organisms all want the same resources.
b. there is enough shelter for all the organisms.
c. ecosystems have unlimited resources.
d. food supplies are very large in the ecosystem.

Explanation:

Competition in an ecosystem occurs when resources (like food, water, shelter, space) are limited and multiple organisms need the same resources. Option A says organisms want the same resources, which aligns with competition causes (since resources are finite). Option B (enough shelter) and D (large food supplies) reduce competition as resources are ample. Option C (unlimited resources) also means no competition. So A is correct.

Answer:

A. Organisms all want the same resources.