Question

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

Answer 1

they have simple structure
they do not have complex organs
they do not have a membrane bound neucleus

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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