Final answer:
Sweat glands and hair roots are part of the skin's accessory structures, extending from the epidermis into the dermis. There are two types of sweat glands: eccrine and apocrine. Hair follicles are accompanied by sebaceous glands that release sebum.
Step-by-step explanation:
Sweat glands and hair roots extend from the skin. More specifically, they develop from epidermal projections into the dermis. The hair follicles are structures from which hairs originate. As an accessory structure of the skin, each hair follicle is associated with a sebaceous gland, which secretes sebum to waterproof the hair. Sweat glands are also known as sudoriferous glands, which are classified as merocrine glands. They excrete sweat through a duct to cool the body when it becomes warm. Two types of sweat glands exist: eccrine glands and apocrine glands. Eccrine glands are primarily involved in cooling the body and are not associated with hair follicles, while apocrine glands are associated with hair follicles and are responsible for a thicker secretion that can lead to body odor when decomposed by bacteria.
The answer to the question is: A. Skin. As for the papillae, the correct response is C. epidermis down into the dermis.