Differentiate between an autotroph and a heterotroph.
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  Autotroph Heterotroph
1. Food: It manufactures its own food. It obtains its food from outside source.
2. Chlorophyll: It has chlorophyll for performing photosynthesis. Chlorophyll is absent.
3. Energy: It is obtained from sunlight and changed into chemical energy. It does not require an external source of energy as the same is present in food obtained from outside.
4. Digestion: It is absent. Food obtained from outside is digested before being absorbed and assimilated.
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