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define autotrophs and heterotrophs class 7 what are autotrophs and heterotrophs class 7 define autotrophic and heterotrophic nutrition class 7 define autotrophic and heterotrophic nutrition with example class 7 define autotrophs heterotrophs and saprotrophs with example class 7 define autotrophs class 7 difference between autotrophs and heterotrophs for class 7 what are autotrophs and heterotrophs
