What term refers to all the organisms of one species living in a defined area?

What term refers to all the organisms of one species living in a defined area?

• A. Population
• B. Ecosystem
• C. Community
• D. Species Richness

Answer: (A)

The main idea here is a population: all individuals of one species living in a defined area. This focuses on how many individuals exist and how they are distributed within that area—for example, the population of rabbits in a field or the population of oak trees in a forest. The other terms describe different concepts. An ecosystem includes both living organisms and the physical environment (air, water, soil, climate). A community includes all the living organisms of all species in the area. Species richness is simply the number of different species present, not the number of individuals of one species.

The main idea here is a population: all individuals of one species living in a defined area. This focuses on how many individuals exist and how they are distributed within that area—for example, the population of rabbits in a field or the population of oak trees in a forest.

The other terms describe different concepts. An ecosystem includes both living organisms and the physical environment (air, water, soil, climate). A community includes all the living organisms of all species in the area. Species richness is simply the number of different species present, not the number of individuals of one species.