dermis {Ans: binds the epidermis to the underlying tissues; causes skin to be tough and elastic; middle layer}first degree burn {Ans: type of burn that affects only the epidermis}fourth degree burn {Ans: type of burn that affects all layers of the skin, muscle, and bone}keratinization {Ans: process in which the cytoplasm of cells is replaced by the protein keratin}melanoma {Ans: a type of skin cancer that occurs when the melanocytes become cancerous}epidermis {Ans: outer layer of skin composed of stratified squamous epithelium; lacks blood vessels}