Question

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?

Answer 1

 I think the answer u are looking for is

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.

Answer 2

The area is most likely has a hot and dry climate where there is very little water, eg in a desert. The leaves are thick and small or not there at all because the plants need to prevent water loss through transpiration.

You didn't give any options, but I hope this helps!