Question

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

Answer 1

Answer:

Primitive organisms are those which have ancient body designs and have not changed much. They have simpler body design and are also called lower organisms. On the other land, the organisms that have acquired more complex structure and body design relatively recently are called advanced organisms.

Explanation:

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Answer 2

Any of the thin, flexible areas of the cuticle of an arthropod located between the segments of the body and limbs.