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fertility |
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fertilityOrganism's ability to reproduce, as distinct from the rate at which it reproduces (fecundity). Individuals that can reproduce are fertile. Individuals that cannot reproduce are infertile. Individuals become infertile (unable to reproduce) when they cannot generate gametes (eggs or sperm) or when their gametes cannot yield a viable embryo after fertilization. Common causes of infertility are: low sperm numbers in the male; blocked oviducts; infrequent ovulation (release of gamete) in the female; consequence of infections in the female reproductive tract; and genetic makeup. |
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| Rivers abound, it is true; but this region is nearly destitute of brooks and the smaller water courses, which tend so much to comfort and fertility. The extent of their experience is pleasantly balanced by the fertility of their imagination. And looking across space with instruments, and intelligences such as we have scarcely dreamed of, they see, at its nearest distance only 35,000,000 of miles sunward of them, a morning star of hope, our own warmer planet, green with vegetation and grey with water, with a cloudy atmosphere eloquent of fertility, with glimpses through its drifting cloud wisps of broad stretches of populous country and narrow, navy-crowded seas. |
fertility
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