Question

10) Yolk sac placenta is found
in.
O Kangroo
O pig
O
man
O O
none​

Answer 1

Explanation:

There are three fetal membranes in mammals, namely the yolk sac, allantois and amnion, but only the first two form a placenta. In Monotremata (monotremes), Marsupialia (marsupials) and Placentalia (eutherians), the yolk sac transfers nutrients originating from uterine glandular secretion or the maternal blood.