• Autotrophic organisms are able to manufacture their own food. There are two types of autotrophic organisms: photosynthetic and chemosynthetic.
• Heterotrophic organisms depend directly or indirectly on autotrophic organisms for foods.
• Heterotrophic organisms may be holozoic (animals), patristic, saprophytic, carnivorous (plants) and symbiotic (mutualistic).
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