EcosystemAn ecosystem is a combination of all the organisms and nonliving (abiotic) factors in an environment. Ecosystems are made up of communities, which are made up of populations and species. Within an ecosystem there are: food chains, energy flows, trophic levels, etc. All of which are basically how energy is transferred from one organism consuming another and so on. it connects to biotic and abiotic because an ecosystem is both of those things in an environment.
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