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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.
an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in...
secretory tissue in the leaves of plants that secretes water through pores in the epidermis or...
is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the...