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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.
self-feeding; makes its own food by the process of photosynthesis.
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...
an artificial device that helps to stimulate and regulate the heart muscle.