Question

What is meant by the species problem'?

(1) The exact definition of species is still
controversial.

(2) The exact mechanisms of speciation is not
known.

(3) The number of species present is much more
than identified species.

(4) The extinction of species is taking place at an
alarming rate.


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Answer 1

Answer:

(4) the extinction of species is taking place at an alarming rate