A very intense summer region with little rainfall causes a decrease in the amount of water for the animals. This is because intense summer evaporates much of the water available to animals, as in this region, rain is scarce, evaporated water takes time to return to the ground, which can cause a severe drought that makes water a limiting factor for animal life.
Therefore, we can conclude that the correct answer to your question is the letter D.
The right answer is actually D)water
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.
equal distribution i think.