Which organisms are called primitive and how are they different from the so-called advanced organisms - Biology - Diversity in Living Organisms

Question

Which organisms are called primitive and how are they different
from the so-called advanced organisms? No irrelevant answer

Riya Gupta · Accepted Answer

Dear Student, An organism which is simple is called primitive A
primitive organism or lower Organism is the one which has simple
body structure and ancient body designs or features that have not
changed much over a period of time On the other hand, an organism
with high level of division of labor; by formation of organs and
organ system is called advanced They have a complex body structure
and organization Regards

Which organisms are called primitive and how are they different from the so-called advanced organisms?......... No irrelevant answer.