<span>The most common type is simple columnar epithelial cells. These cells help the stomach resist degradation by the lumen during digestion. In addition, these cells secrete substances like mucous, HCl, and pepsinogen. All these secretions are necessary for proper digestion to take place.</span>
Guessing 2,270 species are listed as endangered or threatened are on the list, 151 are marine species
use the numbers from here : )
Thr correct answer is -
a. true