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a series of numbers that represents the types and arrangement of the teeth of a mammal.
(also called selectively permeable membrane) a membrane which allows some substances to cross it...
also known as sodium hydrogen carbonate. It is a crystalline white solid that usually appears as...
this muscle 'opens' or straightens the joint when it contracts (so the angle between the two...
pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during ...
a species that helps scientists identify the age of sedimentary rocks.