What layer of skin causes dandruff? Is this the same layer that peels off after a sunburn? How do you know?

What layer of skin causes dandruff? Is this the same layer that peels off after a sunburn? How do you know?

Wrinkles occur with age due to a loss of elasticity and collagen. Which layer of skin do you believe is most responsible? Do you think topical ointments that claim to firm skin really work? Explain why or why not?

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