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Author Question: Compared to sea urchin eggs, those of mammals A) complete the fertilization proc (Read 500 times) |
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Vaccines prevent between 2.5 and 4 million deaths every year.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.