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Ovulation
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Expulsion of a mature ovum from an ovary
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Gamete
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Mature germ cell, either sperm (male) or ovum (female)
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Conception, or fertilization
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Beginning of pregnancy, when the sperm enters the ovum. Fertilization normally occurs in the fallopian tube
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Zygote
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Cell formed by the union of the sperm and the ovum
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Embryo
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Unborn offspring in the stage of development from implantation of the zygote to the end of the second month of pregnancy. this period is characterized by rapid growth of the embryo
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Fetus
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Unborn offspring from the beginning of the third month of pregnancy until birth
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Gestation, pregnancy
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Development of a new individual from conception to birth
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Gestation period
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Duration of pregnancy
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Implantation, nidation
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Embedding of the zygote in the uterine lining. the process normally begins about 7 days after fertilization and continues for several days
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Placenta, or afterbirth
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A structure that grows on the wall of the uterus during pregnancy and allows for nourishment of the unborn child
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Amniotic, or amnionic, sac (also known as bag of water)
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Membranous bag that surrounds the fetus before delivery
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Chorion
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Outermost layer of the fetal membrane
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Amnion
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Innermost layer of the fetal membrane
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Amniotic fluid
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Fluid within the amniotic sac, which surrounds the fetus
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Amni/o, amnion/o
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Amnion, amniotic fluid
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