Answer:
hereditary variat on selection is made of those genetic variats that well be passed on most effectively to the following generation
Early growth of the sexual organs, higher libido and becomes aroused more easily, sperm count possibly will increase.
After the zygote begins to divide, a fluid-filled ball of cells, called blastocyst attaches to the uterine wall.
<span>It is the stage of implantation during the prenatal development. The blastocyst consists of an inner cell mass and the outer layer -the trophoblast. Trophoblast surrounds the inner cell mass and a fluid-filled cavity - blastocoele. Inner cell mass will form embryo and trophoblast gives rise to the placenta.</span>
