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a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the stomach to the duodenum.
organelles that only occur in the green parts of plants. They contain the green pigment...
the actions of the body's immune system that work to fight infections or disease.
the flooding of land, such as the flooding that happens when dams are constructed.
the cavity used for transport purposes. It has one opening to the environment through which...