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Formation o Twins. Identical - 1 egg (ovum) is fertilized by 1 sperm which then divides and separates and grows as two separate embryos. Fraternal - 2 eggs are released from the ovary and are fertilized by 2 different sperm. D. Structures inside the Womb. Placenta. Grows from the outer edges of the embryo. Connects embryo to uterine wall ................
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