Cenozoic Era
The most recent era is the Cenozoic Era. It is also known as the "Age of Mammals." This era saw the largest land mammals and a great increase in the diversity of mammals due to the absence of large reptiles.
What makes something a mammal?
-If it is warm blooded
-If it has vertebrae (backbone/spine)
-If it gives birth to live young (don't lay eggs)
-If it's covered in hair
-If it creates milk for its offspring
What makes something a mammal?
-If it is warm blooded
-If it has vertebrae (backbone/spine)
-If it gives birth to live young (don't lay eggs)
-If it's covered in hair
-If it creates milk for its offspring