which organisms are called primitive and how they are different from so called advanced organisms

Q- Which organisms are called primitive and how they are different from so called advanced organisms?

Answer- The organisms which have a ancient body design and have not done evolution from ancient time period are called as primitive organisms whereas the advanced organisms are those who are advanced in body structure and are performing several advanced metabolic function. 

The advanced organisms are differ from primitive organisms as the advanced organisms are advanced in structure whereas the primitive organisms are bearing primitive body design. 

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