document.write( "Question 69898: Science and medicine. It is estimated that the Earth is losing 4000 species of
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Algebra.Com's Answer #50074 by 303795(602) $\"\"$ $\"About$

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If there were S species living last year and there are 4000 less this year then there must be S - 4000 alive this year. \n" ); document.write( "

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