What prevents the formation of massive clots throughout the cardiovascular system?

This is because the clotting factors are usually in an inactive state during circulation of blood. However, when there is a cut and the blood encounters other tissues during bleeding, the prothrombin is activated. It is proteolytically cleaved to form thrombin. Thrombin then converts soluble fibrinogen into insoluble strands of fibrin.

the answer to your question is b

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.