Environment & Ecology : Indian Biodiversity Landscape

Q 5 / 6
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 ?