Skin, nails and hair make up the
a. skeletal system.
b. integumentary system.
c. muscular system.
d. endocrine system.

b. integumentary system.

Explanation:

Integumentary system includes the skin and other protective appendages of the body which provides protection against the loss of water, injury and other damages could be caused by the external environment. The integumentary system involves hair, feathers, nails, scales and hooves. It also functions in eliminating the waste products, protecting the body from diseases and regulating the body temperatures.

On the basis of the above explanation, Skin, nails and hair make up the integumentary system is the correct option.

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.