[1994]
(a) Oriental and Australian
(b) Palaearctic and Oriental
(c) Nearctic and Palaearctic
(d) Neotropical and Ethiopian
(b) Dr. P. L. Sclater, 1858 divided the world into 6-regions on the basis of distribution of birds only, later in 1876 A.R. Wallace adopted it for all the animals. These six realms (regions) support evidence of organic evolution.
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