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the upper surface of the ground water.
the movement of respiratory gases across a respiratory surface.
a hormone that causes the secretion of gastric juices into the stomach.
(also called polymers) large, more complex molecules formed when monomers join together.
middle body tissue layer that forms the muscular, circulatory and excretory systems.
the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.