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when the male and female gamete fuse in the uterus of the mother, it forms zygote. The zygote then develops into a complete baby in the uterus of mother for about 9 months. After 9 months, vigorous contraction of the muscles of uterus of the mother occur and vaginal canal becomes wide open that causes expulsion/delivery of the baby outside. The delivery of the baby is called parturition.
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