Refers to the biological group that lives in the same place and belongs to the same species. I really haven't heard of it ~ I think the community is bigger than the population, and it should be a large collective living environment composed of several populations. Ecosystem: In a certain natural area, all living things and their living environment are isomorphic into an ecosystem biosphere: between about 1 1000m above sea level and about 10000m above sea level. Including the lower atmosphere, the whole hydrosphere and the upper lithosphere, where there are conditions such as air, water and sunlight to sustain life, scientists call it the "biosphere". The answers to the three questions are absolutely correct.