Why do autotrophic and heterotrophic organisms depend on each other for survival?

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Why do autotrophic and heterotrophic organisms depend on each other for survival?

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Chemically, heterotrophic organisms depend on autotrophs to provide an energy supply and the nutrients deposited in soil from decomposing heterotrophs is essential to maintain a stable environment for autotrophs. But physically, autotrophs themselves can be used as a habitat for heterotrophs; providing essential shelter for survival. In the same physical sense, heterotrophs are essential to the survival of autotrophs as they enable autotrophic plants to reproduce via pollination.