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The Oocyte is a cell in an ovary which may undergo meiotic division to form an ovum.

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Sperm or also called spermatozoon is a cell that is produced by the male sexual organs

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This is when the mixing of the sperm and egg occurs.

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In the first 24 hours, the cell with divide from one into two.  From hours 12-15, The two cells divide to become four. And at the end of 3 days, the fertilized egg cell has become a structure made up of 16 cells.

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Early Embryo is the stage of development where the early stages of development of a multicellular organism. Then the formation of body structures, such as tissues and organs begins formation.

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Yolk sac provides nutrition to the developing embryo until the placenta takes over.

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The heart is the first functional organ in vertebrate embryos, and in the human, beats spontaneously around week 5 of development.

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Around week Eight of the pregnancy, the baby's limbs begin to take shape and fingers have begun forming.

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36 Days: Beginning of the primitive vertebrae, These weeks are the period of the most rapid development of the fetus.

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36 Days: Beginning of the primitive vertebrae, These weeks are the period of the most rapid development of the fetus.

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45 Days: Embryo's heart is beating twice as fast as the mother's.

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45 Days: Embryo's heart is beating twice as fast as the mother's.

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The heart quickly differentiates into the truncus arteriosus, bulbus cordis, primitive ventricle, primitive atrium, and the sinus venosus.

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51 Days: Developing retina, nose, and fingers. The fetus' continual movement in the womb is necessary for muscular and skeletal growth.

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51 Days: Developing retina, nose, and fingers. The fetus' continual movement in the womb is necessary for muscular and skeletal growth.

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12 Weeks: Indifferent penis ( Girl or Boy determination)

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12 Weeks: Indifferent penis ( Girl or Boy determination)

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This stage is where the fetus begins to develop into a male or female

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Baby's brain is developing rapidly at this time, and your baby can see and hear.

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The expulsion stage is lasting from full dilation of the cervix until the baby is completely out of the mother's birth canal.

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Biological beginnings. Child Development. (n.d.). https://earlychildhoodeducationgroupone.weebly.com/biological-beginnings.html.