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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
tough connective tissue found in conjunction with muscle, cartilage and bone.
the factor in an investigation that is under the control of the investigator.
an area of land which is usually covered with shallow water, and which supports plants adapted...
inflammation of the lining of the bronchi and bronchiole causing them to become clogged with...
an organism that helps to spread a disease, but is not infected with the disease.