a. A large number of species
b. An abundance of endemic species
c. Mostly located in the tropics
d. Mostly located in the Polar Regions
Answer: c. Mostly located in the tropics
Explanation: The Biodiversity hotspots are rich in species biodiversity. Not many species of living things exist in cold, snowy regions. Therefore, they cannot be counted in the region of biodiversity hotspots. Biodiversity hotspots are not located in the Polar Regions.