Three of the following criteria have contributed to the recognition of Western Ghats-Sri Lanka and Indo-Burma regions as hotspots of biodiversity:

1.Species richness

2.Vegetation density

3.Endemism

4.Ethno-botanical importance

5.Threat perception

6.Adaptation of flora and fauna to warm and humid conditions

Which three of the above are correct criteria in this context?

CSAT 2011

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