Answer:
population
Explanation:
Could not be an organism beacuse an organism is an individual animal, plant, or single-celled life form.
Could not be an eco system as that refers to a biological community which consist of organisms interacting with their environment.
Could not be a community, that incorporates various species interacting with each other.
Could not be a biosphere as it encopasses the world wide sum of all life forms such as : populations, communites, eco systems.
