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elongated cells in the xylem of vascular plants that transport water and mineral salts.
an antigen preparation that stimulates the immune system to give protection against a particular...
movement of the Earth's continents as the Earth's tectonic plates shift.
the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...
the medical condition whereby the body is unable to control the levels of glucose in the blood...