An absolutely essential growth process that begins within a few hours of fertilization and is a division of cells into identical cells  is called:

The principal male sex hormones are:

What is puberty?

The  prenatal development of  the organs of the fetus assume their specialized functions during the :

The newly fertilized ovum is called a :

About what percent of zygotes die shortly after fertilization?

A medical diagnostic procedure, used by physicians to identify hereditary defects before an infant's birth that draws fluid from the sac surrounding the fetus, is called:

 

SpermS are produced in the man's body in winding tubules within the:

The principle that describes development as starting with the head and brain areas and moving downward is called:

As a result of cleavage, the zygote becomes transformed into a hollow ball of cells called the: