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Author Question: In males of some mammalian species, but not humans, an erection results from a bone that protrudes ... (Read 49 times) |
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
Invasive species in Canada include (a) zebra mussels, Dreissena polymorpha, (b) sea lamprey, Petromy
Species, subspecies, populations, and individuals. Species are reproductively isolated from one anot