Question

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

Answer 1

The organisms which have ancient body designs that have not changed much are called primitive organisms or lower organisms. These are simple life forms. On the other hand, the organisms that have acquired their particular body designs relatively recently, they are called advanced organisms or higher organisms.

Answer 2

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A primitive organism or lower organism is the one which has a simple body structure and ancient body design or features that have not changed much over a period of time.

An advanced organism or higher organism has a complex body structure and organization.

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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