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Question

According to phylogenetic classification, 'species' is
  1. Reproductively isolated
  2. Only geographically isolated
  3. Evolutionary history of an organism
  4. All of the above

A
Evolutionary history of an organism
B
Only geographically isolated
C
Reproductively isolated
D
All of the above
Solution
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The reproductive characteristics, which prevent species from fusing is the isolating mechanisms. Isolating mechanisms are particularly important in the biological species concept, in which species of sexual organisms are defined by reproductive isolation, i.e., a lack of gene mixture.

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