Why do light-fur mice survive LESS often on dark rocks, compared to dark-fur mice?

for a creature with a lighter fur color it is next to impossible to blend into darker colored environments compared to darker fur colored creatures

Light-fur mice survive less often on dark rocks because they are easily seen by predators while dark-fur mice are harder to see.

The same situation applies to dark-fur mice on light rocks.

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.