A small, round cell found in the lower part (or base) of the epidermis, the outer layer of the skin. Anatomy of the skin showing the epidermis (including the squamous cell and basal cell layers), dermis, subcutaneous tissue, and other parts of the skin.
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Basal cells are found at the bottom of the epidermis — the outermost layer of skin. Basal cells produce new skin cells. As new skin cells are produced, they push older cells toward the skin's surface, where the old cells die and are sloughed off.
The Rocky Mountains are a major mountain range located in the American Midwest that span more than 3000 miles. both a and c are correct. They are not part of the grand canyon.