Question

How classification systems have undergone several changes over a period of time?

Answer 1

Then, Stanley described viruses, viroids, etc. Thus, over a period of time, classification system have undergone several changes.

Answer 2

Answer:

Biological classification is a scientific procedure of arranging organism in hierarchical series of group and subgroups on the basis of their similarities and dissimilarities. Scientist have proposed different system of classification which has undergone several changes from time to time.