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a species that helps scientists identify the age of sedimentary rocks.
a physical and psychological dependence on alcohol, which affects every aspect of a person's...
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...
a microscopic hair-like extension of the cell membrane of the epithelial cells forming the outer...
small solid particles of matter such as soot, ash, metal and dust.
the process whereby certain substances are removed from a liquid and others retained, due to...