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What causes arthritis?

MedlinePlus cites normal wear and tear on bone joints, viral or bacterial infections, injuries and autoimmune diseases as common causes of arthritis. Osteoarthritis is the most common type, and it is caused …

How do hormones affect behavior?

According to Sciences 360, hormones affect many facets of human behavior, including emotions, health, sexual attraction and even weight. Sciences 360 defines hormones as chemicals created by a cell or organ that …

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