The correct option is D 34
Biodiversity hotspots
Biodiversity hotspots are regions on Earth with a high density of biodiversity, especially containing species that are endemic to that region. These hotspots are threatened by human habitations. Hotspots are irreplaceable as they are the richest source for vulnerable species. These are one of the in situ methods of conserving biodiversity.
Number in the world
There are a total of 34 biodiversity hotspots found in the world. Initially, there were only 25 hotspots but then 9 more were added.