Check all that are characteristics of the esophagus. check all that apply a) the mucosa is composed of thick, nonkeratinized stratified squamous epithelium. b) the mucosa is composed of thick, nonkeratinized stratified squamous epithelium. c) it is composed entirely of smooth muscle. it is composed entirely of smooth muscle. d) the two layers of muscle in the superior one-third of the muscularis are skeletal. e) the two layers of muscle in the superior one-third of the muscularis are skeletal. f) it is located almost entirely in the abdomen. it is located almost entirely in the abdomen.