Q. 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 ? 

1. 1,2 and 6
2. 2,4 and 6
3. 1,3 and 5
4. 3,4 and 6