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

Extinction of these species from other regions

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Continental separation

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Absence of evolution in these areas

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Retrogressive evolution

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Solution

The correct option is D Continental separation
Endemic species are those species which are found in a restricted area. South America and Australia have unique endemic species which are not found anywhere else. Seas and oceans form barriers to free intercontinental movement of animals and plants and separate the living species across different continents, causing evolution and endemism.

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