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the non-living ground tissue with thick-walled cells that gives strength, support and protection to a plant. Cells occur as fibres and sclereids.
a space or gap between two teeth. Many species of mammals have diastemata as a normal feature,...
the growth of cities due to the influx of people from rural areas.
the actions of the body's immune system that work to fight infections or disease.
the blood circuit from the heart to the body and back to the heart.
the last part of the mammalian large intestine, which stores faeces until it can be expelled...