embryo
the developing human organism from about 2 weeks after fertilization through the second month
fetus
the developing human organism from 9 weeks after conception to birth
ovum
A mature egg cell
amniotic fluid
fluid within the amniotic sac that surrounds and protects the fetus
Placenta
A structure that allows an embryo to be nourished with the mother's blood supply
Sperm
Male sex cell
umbilical cord
a tube containing the blood vessels connecting the fetus and placenta
Zygote
fertilized egg
premature
Too early; happening or arriving before the proper time
conception
the moment at which a female becomes pregnant
eggs
female sex cells
Ovaries
Glands that produce the egg cells and hormones
Fertilization
Process in sexual reproduction in which male and female reproductive cells join to form a new cell