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an injection of a weakened or dead pathogen into the body to build up immunity against a disease.
the blood circuit from the heart to the lungs and back to the heart.
the process whereby substances dissolved in the blood (such as H+ ions, nitrogenous waste and...
mass extinction event of 65 million years ago, in which about 85% of all species on Earth died...
simple epithelium with cuboidal shaped cells that lines various glands with a secretory function...
highly addictive substance found in tobacco that accelerates the heart rate, and contracts and...