Question

Why are the classification systems changing every now and then?

Answer 1

Biologists have employed a variety of features for classification systems since the very beginning. These include biochemistry, ontogeny, phylogeny, anatomy, cytology, physiology, and reproduction. However, biologists are constantly discovering new information about pets through their fossil records and "advanced study techniques like molecular phylogeny, etc." Thus, their perspective on classification continues to shift. As a result, the classification scheme is frequently modified.