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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
external opening of the rectum (part of the mammalian digestive tract) through which faeces are...
a species that has a large effect on its environment relative to its abundance and plays an...
regions or bundles of vascular tissue consisting of xylem and phloem separated by cambium.