18. primary sex characteristics have to do with
a. qualities such as beard growth in males.
b. qualities such as breast development in females.
c. the growth and function of the reproductive organs themselves.
d. "masculine" and "feminine" body features.

C. Secondary sex characteristics include; increased fat deposits in *Breasts, thighs, & butt for females.* & *Penis & butt for males* and more.

post-impressionism is a predominantly french art movement that developed roughly between 1886 and 1905, from the last impressionist exhibition to the birth of fauvism. post-impressionism emerged as a reaction against impressionists' concern for the naturalistic depiction of light and colour.

explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.