External ears (pinnae) are found in:

Which group of mammals has functional mammary glands in both males and females?

$A$: In metatherians,the scrotum is present in front of the penis.
$R$: In prototherians,the scrotum is present behind the penis.

What is common among whales,bats,and rats?

Assertion $A$: Mammals are viviparous.
Reason $R$: In mammals,the developing embryo receives nutrition from the maternal body and is born as a living offspring.

Bats are included in the same taxonomic class as.....