The occurrence of endemic species in South America and Australia is because:

1.  these species have been extinct in other regions
2.  of continental separation
3.  there is no terrestrial route to these places
4.  of retrogressive evolution

Subtopic:  Concept of Speciation |
 77%
From NCERT
AIPMT - 2001
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh