Cerebrovascular disease occurs due to:.a. the presence of an abnormal gene. b. tissue damage in the brain due to a shortage of blood supply. c. a deficit in acetylcholine. d. plaques in the brain.

b. tissue damage in the brain due to a shortage of blood supply

Explanation:

Cerebrovascular disease is a group of conditions, diseases, and disorders that affect the blood vessels and prevents blood supply to the brain.

If there is a blockage, malformation, or blood clot that prevents the brain cells from getting enough oxygen, it can lead to brain damage.

Causes of Cerebrovascular disease includes atherosclerosis i.e narrow arteries, thrombosis, blood clot in the artery of the brain,blood clot in a vein of the brain.

Example of Cerebrovascular diseases include stroke, transient ischemic attack (TIA), aneurysm, and vascular malformation.

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.  

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds