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simple inorganic chemical substances (mineral salts) that are needed in very small amounts for normal growth and development of a living organism.
invisible, short-wave radiation emitted by the sun, which can cause cancer in humans.
(also called secondary meristems) regions of cells capable of dividing to form new cells in the...
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
semi-liquid mass of partially digested food and gastric juices, produced in the stomach.
the outermost layer of the stele or vascular cylinder in a dicotyledonous plant root. Lateral...