Question

how does a whale stand unique to the mammal group

Answer 1

because it is the only aquatic animal which is mammal and it is one and only one aquatic animal which has 4 chambered heart

Answer 2

Mammals are all warm blooded animals , they breath air, have hair, and moms feed milk to their babies ....Whales actually do all of these things ....Whales breath air with their lungs using their blowholes to breath out ....they come to the surface of water so they can breath just like us ......