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In engine and cell(similarities)
1 They both are functional units
2 They both engage in the various process performed by the body
3 They both need Fuel

In engine and cell(differences)
1 Cell are living engine is non living
2 Cell need ATP as fuel, engine needs gasoline or diesel
3 Cell are functional units smallest units in a body, engine are not smallest

10 4 10
ATP-Adenosine Tri phospate molecule
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