Question
Which organisms are called primitive and how are they different from the so-called advanced organisms?
Solution
The organisms which have ancient body design that that have not changed much over the course of time, are known as primitive or lower organism.
Advanced organisms are those who have accumulated changes and acquired their particular body designs relatively recently.
The difference between the two are :
1. Primitive organisms have simpler body design where as advanced or younger organisms have complex body design.
2. Primitive or lower organism have not changed much whereas the advanced organisms are those who have acquired their particular body designs relatively recently and possess changes.
