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You're either talking about Community which means grouping of different organs or population which is the grouping of the same organ
Bond covalent. monomers are joined together by a dehydration reaction in which two molecules are covalently bonded to each other through the loss of a water molecule
The answer is Nephritis -
Nephritis is a condition in which the nephrons, the functional units of the kidneys, become inflamed. This inflammation, which is also known as glomerulonephritis, can adversely affect kidney function.