Final answer:
Skin appendages include hair follicles, sebaceous glands, and eccrine glands, which originate from the epidermis and have various functions such as hair production and thermoregulation. Correct options are A), C) and D)
Step-by-step explanation:
The cells or structures classified as skin appendages are A. Hair follicles, C. Sebaceous glands, and D. Eccrine glands. Skin appendages are accessory structures that include hair, nails, sweat glands, and sebaceous glands. These structures originate from the epidermis and extend through the dermis. Hair follicles produce hairs that pass through the skin surface. Sebaceous glands are associated with hair follicles and secrete sebum, which conditions and waterproofs the hair. Eccrine glands are a type of sweat gland that releases sweat to help regulate body temperature.