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Males produce 1,000 sperm per every heart beat, taking about 90 days to mature. Females are born with around 400,000 eggs which tend to deteriorate over time, and once they are all gone, menopause begins. Each month 2 or 3 ova leave the ovaries and literally float from the ovaries to the fallopian tubes, where they may or may not find a sperm to say hi to. In one week (7 days) after fertilization the human embryo consists of about 64 or 128 cells arranged around a central cavity forming the blastocyst (depending on how fast it is dividing).

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