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?

 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: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: