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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
the part of the hindbrain that controls autonomic functions such as breathing, digestion, heart...
is the passing of traits to the offspring from its parents or ancestors. The study of heredity...
(also called elimination or defecation) the process whereby undigested food remains are expelled...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.