During which period did mammals first appear?
a.
b.
C.
Pleistocene
Carboniferous
Cretaceous
d. Jurassic
Please select the best answer from the choices provided
000
ABCD
a.
b.
C.
Pleistocene
Carboniferous
Cretaceous
d. Jurassic
Please select the best answer from the choices provided
000
ABCD