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Hotspots are regions of high:
A. Rarity
B. Endemism
C. Critically endangered population
D. Diversity

Answer
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Hint: The idea was first introduced by Norman Myers in two articles he published in The Environmentalist in 1988 and 1990. After careful consideration, Myers and others revised the idea and published it as "Hotspots: Earth's Biologically Richest and Most Endangered Terrestrial Ecoregions" and a paper in the journal Nature, both in 2000.

Complete step by step solution:
Just 2.4% of the planet's surface is occupied by biodiversity hotspots, which are home to different ecosystems. Myer initially found ten hotspots; the current 36 once covered more than 15.7% of the total area but have lost about 85% of their area. Due to habitat degradation, only 2.4 percent of the planet's land surface is occupied by the 60 percent of terrestrial species. Rapid deforestation is placing significant stress on the populations of indigenous plants and vertebrates on Caribbean islands like Haiti and Jamaica. Additionally, the Tropical Andes, the Philippines, Mesoamerica, and Sundaland will certainly lose the majority of their plant and animal species if deforestation continues at the current rate.

A hotspot is a geographical area that is a biodiversity hotspot and is extremely sensitive to exploitation. 35 biodiversity hotspots have been recognised worldwide. A hotspot for biodiversity is a forest.

A biogeographic area with high levels of biodiversity that is in danger of being destroyed is referred to as a biodiversity hotspot. a woodland regarded as a hotspot for biodiversity.

Therefore, choice B is the right response, Endemism

Note:
A region must meet both of the following requirements, according to Conservation International, in order to be considered a hotspot:
The area should feature a high level of endemism and at least 1500 different species of vascular plants.
It must be endangered if it still contains 30% (or less) of its natural habitat.