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an injection of a weakened or dead pathogen into the body to build up immunity against a disease.
the blood vessel that carries blood from the digestive tract to the liver.
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
rhythmical wave-like muscular contractions of a duct in order to cause movement of substances...
a small finger-like projection found on the inner folds of the small intestine, which increases...