A population is a group of individuals of the same species that occupy the same area.
A community is all of the populations of organisms that occupy the same area.
An ecosystem is all of the living organisms and the nonliving factors in the same area.
The area in the question is the "pond". So there are seven populations in the pond. 1. trout 2. insects 2. trees 4. birds 5. beavers 6. deer 7. microorganisms
There is one community and it includes: trout, insects, trees, birds, beavers, deer and microorganisms.
The ecosystem is a temperate deciduous forest with cold winters and moderate rainfall. The living organisms in the ecosystem include trout, insects, trees, birds, beavers, deer, and microorganisms.
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