Answer:
A and B
Step-by-step explanation:
In any ecosystem, the basic resources that organisms need for survival are always in limited supply. Examples of these resources include food, water, sunlight, oxygen, and shelter.
The finite supply of resources in an ecosystem directly affects the way that organisms in that ecosystem interact with each other. For example, resource limitations can cause an increase in competition among members of an ecosystem. Additionally, if the members of a species are not able to secure enough resources for survival, they will be eliminated from the ecosystem. In extreme cases, entire species may become extinct.