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a relationship between two different organisms, of different species, from which at least one of the organisms benefits.
cartilage with few collagen fibres and no elastin fibres. It reduces friction in joints,...
when a plant cell loses water and the cell membrane pulls away from cell wall.
the development of a distinct head, with a concentration of nervous tissue and sense receptors...
living ground tissue with thick-walled cells that gives strength, support and protection to a...