Do autotrophs and heterotrophs both use cellular respiration?

Is cellular respiration a AUTOTROPH or HETEROTROPH?Remember that organisms that do photosynthesis or chemosynthesis (make their own food molecules) are called autotrophs. Heterotrophs obtain their food molecules by eating other organisms. Animals, fungi, many protists and many bacteria are heterotrophs. Plants, some protists and some bacteria are autotrophs
             
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The answer to this is b