Question

On what basis are mammals classified into different groups, and what these groups?

Answer 1

In this classification, all living mammals are divided into two subclasses: Prototheria, which includes monotremes, and Theria, which includes the infraclasses of metatherian (marsupials) and eutherian (placentals) mammals. Simpson grouped placental mammals into about 30 orders, of which 17 were still living.

Answer 2

Answer:

All mammals are classified into

• Two subclasses.