The answer is b - high diversity and food. Having a high starting diversity is an absolute prerequisite for a certain area to even start having a lot of different organisms living in the same spot. The other prerequisite is having a lot of food. This enables the nourishment of big numbers of different species which enable high biodiversity.
What makes an area a biodiversity hot spot? a. high diversity and medicine b. high diversity and food c. many endemic species and medicine d. many endemic species and high diversity