Final answer:
The connected to the hair follicles and produce oil, which protects the surface of the skin to inhibits the growth of microorganisms on the skin.
Step-by-step explanation:
Sebaceous glands are connected to the hair follicles and produce oil called sebum. Sebum is secreted into the hair follicles and makes its way to the surface of the skin, protecting it by waterproofing the hair and skin, preventing them from drying out. It also has antibacterial properties that inhibit the growth of microorganisms on the skin.
For example, when sebum is produced in excess, it can cause the hair follicles to become plugged and infected, leading to the development of pimples. Teenagers are particularly prone to this due to hormonal changes. Regular washing of the skin can help decrease the amount of sebum and prevent the formation of pimples. So therefore sebaceous glands connected to hair follicles produce oil called sebum, which waterproofs the skin and hair and inhibits the growth of microorganisms on the skin.