Question

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

Answer 1

Primitive organisms

These are less complex organisms that have a simple body design and undergo changes in their body structure and functions and are called primitive organisms.

Advanced organisms

These are very complex organisms that have relatively complex body designs and they evolved much and are termed Advanced organisms.

Difference between primitive and advanced organisms

S.No	Primitive organisms	Advanced organisms
1.	1. They are also termed lower organisms	1. They are also termed higher organisms
2.	2. They have ancient body designs so they are not evolved much with time	2. They evolve and form a complex body structure