I have unorganized nuclei, I look like I have many layers but only have one true layer, and typically have hair like structures. Who am I?

Pseudostratified Ciliated Columnar Epithelium

Simple Columnar Epithelium

Stratified Columnar Epithelium

Stratified Squamous epithelium

Pseudostratified Ciliated Columnar Epithelium

Explanation:

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

the index of refraction of the second medium is higher. i just took the test trust me !