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(also called radioactive dating) a method of measuring the age of fossils based on how much radioactive decay has taken place in the radioactive elements or isotopes that occur naturally in fossils
a molecule that stores large amounts of energy that can be used for metabolic activity.
rhythmical wave-like muscular contractions of a duct in order to cause movement of substances...
the part of the lung where the bronchi, bloodvessels and nerves enter and leave the lungs.
(also called egestion or elimination) the process of passing faeces out through the anus.