Species - Groups of organisms that can potentially interbreed to produce fertile offspring, Community - Formed by populations of different species living together and interacting with each other, Population - The total number of organisms of the same species in the same habitat at the same point in time, Autotrophs - Organisms that obtain inorganic nutrients from the abiotic environment, Heterotrophs - Organisms that obtain organic molecules from other organisms via different feeding mechanisms and different food sources, Habitat - The environment in which a species normally lives, or the location of a living organism, Ecosystem - A community and its abiotic environment (i.e. habitat), Ecology - The study of the relationship between living organisms, or between living organisms and their environment, Cosnumers - Heterotrophs that feed on living organisms by ingestion, Detritivores - Heterotrophs that obtain organic nutrients from detritus by internal digestion, Saprotrophs - Heterotrophs that obtain organic nutrients from dead organisms by external digestion, Mixotrophs - Certain unicellular organisms may on occasion use both forms of nutrition, depending on resource availability,

IB Communities and ecosystems

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