The epidermis
a. has an outermost keratinized layer that is tough, airtight, and fairly waterproof.
b. contains melanocytes, keratinocytes, Langerhans cells, Granstein cells, and transient T lymphocytes.
c. has a richly vascularized inner layer.
d. both (a) and (b) above.
e. all of these answers.
D
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