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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 tough substance made from a modified polysaccharide that contains nitrogen. It is the main...
the excessive growth of alga and hydrophytes in response to the addition of artificial or...
movement of the Earth's continents as the Earth's tectonic plates shift.
the main vein that returns deoxygenated blood from the lower parts of the body to the right...