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. it is located almost entirely in the abdomen.

Option (A) and (D).

Explanation:

Esophagus may be defined the long tube like structure that connect the throat with the stomach. The partially digested food from the buccal cavity to the stomach is pass down through the esophagus.

The mucosa of the esophagus contains the thick layer of the nonkeratinized squamnous epithelium. The smooth muscles are present in some layers only. The two layer of the muscle that are superior to the one third of the muscularis are the skeletal muscle.

Thus, the correct answer is option (A) and (D).

b. the carbon cycle ensures living things have a source of hydrogen