The internal skeleton of mammals is called a(n)

Mammals usually undergo ______________ reproduction.

The protein that makes up hair, fingernails, and claws is called

Chiroptera is an order that which organism belongs to?

Which animal is a mammal?

Members of Aves are

Egg-laying mammals are called

Teeth used for grinding up food

Feathers that keep a bird warm are considered ___________.

Flight feathers are called _____________ feathers.

An example of a marsupial is a(n)

The echidna is a(n)

When an unborn organism has an umbilical cord, its nutrient supply comes from the _________________.

Place where milk is produced in a placental mammal

Another word for the egg-white is the

Birds receive oxygen while exhaling from stores in their ______________.

Many bones in bird wings have _________ between them, enabling the organism to fly.

Birds may consume food and store it in their __________.

The rhinoceros is an example of a(n)

The gorilla is an example of a(n)

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