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Arrange the periods of palaeozoic era in ascending order in a geological time scale:
(a)Cambrian Ordovician Silurian Devonian Carboniferous Permian
(b)Cambrian Devonian Ordovician Silurian Carboniferous Permian
(c)Cambrian Ordovician Devonian Silurian Carboniferous Permian
(d)Silurian Devonian Cambrian Ordovician Permian Carboniferous

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Important Questions on Genetics & Organic Evolution
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Reason : When members of a species are geographically isolated they give rise to a sub species.

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