Question

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

Answer 1

Answer:

The organisms which are not complex like other multicellular organisms are called primitive organisms.They are different because they are single celled and do not undergo the same processes like cell division and so on.

Answer 2

Primitive organisms are the organisms that exhibit a very simple and basic cell arrangement, mechanism and structure and no division of labour is observed. Advanced organisms, on the other hand, are the organisms possessing millions of cells that are grouped into various organs performing different functionality such as mammals