They are Monotremes, marsipuals, eutherians.
The 3 subclasses of mammals are monotremes, marsupials and placental mammals.
Subclasses are classes that inherit from parent classes. i.e. ArrayList is a subclass of List.
No
what are mammels that live on land called? they are called terresteral creatures
yes
Yes.
mammalogist
Yes they are.
Yes.
Yes.
No they have gills
yes