It makes the sperm cells capable of fertilization by releasing the concentrated enzymes contained in the acrosome, a region of the sperm cell head.

Spermatozoa may remain viable in the female reproductive tract for as long as:

After fertilization, multiple cell divisions have produced an embronic mass about 12 - 16 cells, called:

The embryonic mass develops a cavity and is known as the ________.

Site of implantation.

As the embryo matures, the connecting stalk elongates and becomes the _________________

Epidermis of skin derived from:

Limb buds begin to form about _____ days after fertilization.

Which of the following is derived from the endoderm?

During the fetal period, fetus increases 15-fold in length and 1400-fold in weight.

The process by which the baby is born.

The period between birth and death.

Life stage from 14-56 days after fertilization

It occurs as irreplaceable cells wear out and the tissue becomes more brittle and less able to repair damage.

The study of heredity---that is, the characteristics children inherit from their parents.

There are how many pairs of autosomes?

There are how many chromosomes in human?

The sex chromosomes of male consist of:

Although most people develop normally and are born without defects, approximately ____ of every 100 people are born with a birth defect so severe that it requires medical attention during the first year of life.