THe ___ gland regulates the blood's calcium levels.

The ___ produces insulin and glucagon, which control the blood's glucose levels

Which two glands work together to control many body activities?

When does a zygote turn into an embryo?

Which is NOT true of the tesets

Fertilization usually occurs in

The uterus develops a thick lining in order to

The menstrual cycle takes about

An embryo becomes a fetus

The amniotic sac's job is to

During labor,

Identical twins come from

___ controls the development of adult male characteristics

Which is true about semen?

Which is not part of the female reproductive system?

How often are eggs released?

An unfertilized egg will

The blood of the fetus and the mother do not mix.

A fetus is connected to the placenta by the

The last stage of childbirth is

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