Placement mammals develop

a. in a egg laid in water

b. in a pouch on their mothers body

c. inside the mothers body

d. inside a amniotic egg

C. Inside the mother's body.

Hope this helps you out!

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.