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a hormone that causes the secretion of gastric juices into the stomach.
a relatively small, similar building block of larger molecules (polymers).
energy resources such as coal and oil, which are being used up much more quickly than they can...
the teeth found at the back of the mammalian jaw. In herbivores they have broad surfaces and...
involuntary muscle found in the walls of blood vessels, in digestive, respiratory, urinary and...