Placental mammals house the embryo until it is complete and birth what?
Female mammals female gametes small egg piles after hatching large and mature infants very premature babies in their pouches litters of twelve
A B C D E F G H
Placental mammals house the embryo until it is complete and birth what? (A) Female mammals (B) female gametes (C) small egg piles (D) after hatching (E) large and mature infants (F) very premature babies (G) in their pouches (H) litters of twelve