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The arithmetic of human sperm A young, healthy man produces about 1000 sperms every second, which comes to about 90 million per day [1]. These sperms are stored in the epididymis and ductus deferens until ejaculation. With several days of storage, the number can easily become big enough to allow for multiple ejaculations on the same day. The maturation ...


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Actually an ovum doesn't ever start cell division because once it is fertilized by a sperm the combination of the two cells is call a zygote. In humans, the zygote proceeds with the many steps following fertilization leading to the first division; this takes on the order of 24 to 30 hours. At that point the set of cells may be termed an embryo or various ...


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Well, strictly speaking from an etymological viewpoint, a clutch is: "a brood, the number of eggs incubated at any one time," in reference to chickens, 1721, a southern England dialectal variant of cletch (1690s), noun from cleck (v.), which is from Middle English clekken "to hatch, give birth to" (c. 1400), which is probably from a Scandinavian source (...


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