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a hard granule of crystallised minerals which forms in the kidney.
ground tissue with thin-walled cells that makes up most of the plant body. These cells are used...
small fluid-filled spaces in the matrix of bone and cartilage in which cartilage and bone cells...
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...
a gland which secretes substances, usually enzymes, through a duct directly to the part of the...