Occurrence of higher number of endemic species in South America and Australia is due to

Retrogressive evolution

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Continental separation

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These species have become extinct from other regions

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Absence of terrestrial links between these places

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Solution

The correct option is B Continental separation
Continental drift was a hypothesis that clarified how landmasses move position on Earth's surface. Put forward in 1912 by Alfred Wegener, a geophysicist, and meteorologist, mainland float additionally clarified why to resemble the other alike creature and plant fossils, and comparative shake arrangements, are found on various landmasses.
So, the correct option is 'Continental separation'.

Suggest Corrections

	Column I		Column II
(a)	Endemic species	(i)	Species that exist in very small number
(b)	Endangered species	(ii)	Species found exclusively in a particular area
(c)	Vulnerable species	(iii)	Species that are likely to become endangered
(d)	Rare species	(iv)	Species that are likely to get extinct in the near future