Question

the surge of sex hormones that accompanies puberty has a wide range of effects on the body. one of those effects is to enhance the activity of the sebaceous glands, increasing the production of sebum. which of the following is the most likely to result from the increased sebaceous activity?
increased cooling of the skin.
increased hair growth.
increased oily appearance and more acne.
decreased vitamin d synthesis.

Explanation:

Sebum is an oily substance. When sebaceous gland activity increases, more sebum is produced. Excess sebum can make the skin look oily. Also, when pores get clogged with sebum (along with dead skin cells etc.), acne can form. Cooling of the skin is mainly related to sweat glands (sweat evaporation cools the skin), not sebaceous glands. Hair growth is more related to hair follicle - related hormones and structures rather than sebaceous gland activity. Vitamin D synthesis in the skin is related to sunlight exposure and the skin's ability to convert precursors to vitamin D, not sebaceous gland activity.

Answer:

Increased oily appearance and more acne.