Answer: a. the lowest trophic level
Explanation:
The keystone species is the one on which the entire ecosystem depends upon. It maintains a balance in the ecosystem. If this species is removed the ecosystem will drastically change. The members of the keystone species are abundantly available at the lowest trophic level. This will help in making a balance in a community or ecosystem. If some members die others will be available to survive others.
Cancer is a disorder in which some cells have lost the ability to control their growth rate.
The primary consumer in the food chain is the bottom level of animals that eat plants and grasses for nutrition.
FOR EXAMPLE: grasshopper
C)because many orginisms can live in the same area.However an ecosytem does not always eat the same the same food
