In an area with plants that have thick, small leaves or no true leaves at all, which of the following other conditions are most likely to exist as well?

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It is near 30o latitude north or south or on the leeward side of a mountain range. Moist air is rising over the area. Night temperatures are much colder than daytime temperatures. The soil has a thick layer of decomposed, nutrient-rich organic material. There is an extremely high diversity of species in the area. There is little rainfall and frequent fires regularly cut the vegetation to the ground.