The occurrence of endemic species in South America and Australia is due to  

1. Extinction of these species from other regions

2. Continental separation

3. No terrestrial route to these places

4. Retrogressive evolution 

Subtopic:  Concept of Speciation |
 73%
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh