The stem cells which have potency to give rise to all tissues and organs are formed from

The capsule enclosing testis of mammal is called as

Ectopic pregnancies are referred to as

Give the name of two hormones $A$ and $B$ in the figure given below

After a sperm has penetrated an ovum in the process of fertilization, entry of further sperms is prevented by

The human embryo is about one inch in length after