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(also called an extinction event) the sudden dying out of large number of species over a short period of geological time.
is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the...
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
many-celled, complex organisms with cell differentiation and specialised tissues performing life...