. Which one of the following provides the best estimate of
the world’s biological diversity?
(a) Of about ten million species probably alive today, some
20 species are lost everyday, most of them unknown because
no more than half a million have yet been actually
identified by scientists
(b) Of about thirty million living species, some 50 are lost
everyday, most of them unknown because no more than one
million have been actually identified
(c) Of about forty five million living species, some 100 are
lost everyday, most of them unknown because no more than 1.5
million have been actually identified
(d) Of about seventy five million living species, some 500
are lost everyday, most of them unknown because no more than
3 million have been actually identified
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(c) Of about forty five million living species, some 100 are
lost everyday, most of them unknown because no more than 1.5
million have been actually identified
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