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the study of fossils.
a mass of undifferentiated cells resulting from uncontrolled mitotic cell division in body...
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...
the difference between the concentrations of a specific molecule in two adjacent areas.
a molecule that is built up of two or more different elements that are chemically joined...
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.