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There are more bacteria in your mouth than there are people in the world.

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The horizontal fraction bar was introduced by the Arabs.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

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Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Synthesis of the active hormone formed from vitamin D or its precursor in skin. Synthesis of the active hormone formed from vitamin D or its precursor in skin.
Steroid hormone interacting with an intracellular receptor. Steroid hormone interacting with an intracellular receptor.
Electron-micrograph of human sperm. Electron-micrograph of human sperm.
Abiotic production of biomolecules Abiotic production of biomolecules
Motile sperm cells of algae and seedless plants. Motile sperm cells of algae and seedless plants.
Drugs for Hormone Replacement Therapy and Uterine Abnormalities Drugs for Hormone Replacement Therapy and Uterine Abnormalities
Video: Apicomplexan life cycle Animation

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