What is the difference between a population, community, and an ecosystem?
The difference would be the factors (biotic or abiotic) which are included in each level of organization.
First, let's review biotic and abiotic factors.
Biotic factors are living organisms, an example would be a deer.
Abiotic factors are non-living objects, an example would be the air.
Population - All the members of one species that live in a defined area.
Community - All the different species that live together in an area.
Ecosystem - All the living and non-living components of an area.
Here is a video to help with this concept.
Hope this helps!