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The familiar sounds of your heart are made by the heart's valves as they open and close.

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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

Directionality of the hydrogen bond Directionality of the hydrogen bond
The effect of a double bond on the shape of fatty acids The effect of a double bond on the shape of fatty acids
Cellular Receptors Cellular Receptors
Control of Respiration Control of Respiration
Control of Respiration Control of Respiration
Respiration in chelicerates Respiration in chelicerates
Video: Lower Limb Arteries Animation

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