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Question 1

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

Answer

Primitive organisms are those  which have a simple body structure (lower organisms) and ancient body design  that have not changed much. The organisms that have acquired more complex structure and body design are known as advanced organisms or higher organisms. For example, an Amoeba is more primitive as compared to a starfish. Amoeba has a simple body structure and primitive features as compared to a starfish. Hence, an Amoeba is considered more primitive than a starfish.

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