The integumentary system has many functions, one of which is multiple choice production of vitamin e. prevention of albinism. protection from cancer. detection of heat and touch. regulation of acid-base balance.

The answer is the detection of heat and touch. The integumentary system consists of the skin, nails, glands, hairs, and nerves. The nerves are responsible for sensing stimuli including pressure, heat, and touch. Another example of its function is acting as a physical barrier against harmful microorganisms and excretion.   

we solve the problem using the hardy-wineberg equation.

let us start with the homozygous recessive proportion of individuals with sickle cell anaemia,

we have the proportion as q² = 0.25.

∴ q = 0.5 (frequency of hbs in population)

further,

solving for the frequency of normal cell by using the fact that,

p + q = 1

∴ p = 1 - 0.5 = 1 - 0.5 = 0.5

now we can calculate 2pq in p² + 2pq + q², which is the frequency for heterozygous carriers of sickle cell anaemia,

∴ 2pq = 2 x 0.5 x 0.5 = 0.5

and the homozygous normal cell individuals proportion is given by the expression,

∴ p² = 0.5² = 0.25

hence, the carriers for sickle cell anaemia are in proportion, 0.5, or 50%.