Biodiversity hotpots
Step-by-step explanation:
All of the given option can be the biodiversity hotspots EXCEPT:
Tundra biome.
Biodiversity is defined as the total number of species present within a biogeographic region.
A biodiversity hotspot is that geographic area where significant biodiversity exists.
A tropical biome, a mountain ecosystem and an island ecosystem can have a significant biodiversity depending on the climate and other environmental condition.
A tundra biome is totally covered with snow and have a very few areas of vegetation and could support only a few species So it cannot be a choice for Biodiversity hotspot.