Changes in dna are known as mutations and can sometimes produce beneficial changes in populations. a
mutant form of the normally light-colored peppered moth is dark-colored. the dark-colored moth blends in with
soot-covered trees in heavily polluted areas. why would the dark-colored mutation be beneficial in a polluted
area?

(a) they have a longer life span than light-colored moths.

b) they cannot be seen as well by predators.
they taste bad to most of their predators.

c they taste bad to most of their predators

(d) they produce more young than do light-colored moths

the answer is c) abandoned properties that are contaminated with hazardous materials.

option c is the correct answer.

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.  

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.