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the movement of respiratory gases across a respiratory surface.
a system of veins which carries blood from the digestive tract to the liver.
a hormone that causes the secretion of gastric juices into the stomach.
bacteria that convert nitrogen in the air into compounds such as nitrites, nitrates and ammonia...
a series of numbers that represents the types and arrangement of the teeth of a mammal.
the natural resistances with which a person is born. It occurs because of a body's genetic make-...