The answer is B <span>Endocrine system </span>
It is indeed A, all of the other answers would be examples of how not to conserve non-renewable resources
Answer:
An ecosystem only has a certain amount of resources to support a certain number of organisms.
Explanation:
An ecosystem consist of resources and organisms. Resources are the material which are responsible for the survival of living organisms in that ecosystem. Examples of resources are light, water, oxygen and food substance. In the absence of these resources, organisms will die.