Answer:
<u>Viviparous</u>
Explanation:
I think that's the word you are looking for
Viviparous animals give birth to live offspring after they have developed in the parent's body
<em> The opposite of this would be Oviparous, meaning an animal that lays eggs.(birds, etc)</em>
<em />
Fun fact:
the echidna (also known as a spiny anteater) and the duck-billed platypus are the only mammals known to lay eggs!
It would be a body fossil
It produces air which is essential and the main reason plants and such are needed
