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Index Fossils <span>can be used to determine if two rock layers were deposited at the same time.</span>
It's the 4 the answer I hope it has served you
Answer:
hair follicles
Explanation:
The inner layer of the two main layers of the skin. The dermis has connective tissue, blood vessels, oil and sweat glands, nerves, hair follicles, and other structures. It is made up of a thin upper layer called the papillary dermis, and a thick lower layer called the reticular dermis.