Answer:
The correct answer will be option-B
Explanation:
The environment of the stomach is acidic in nature maintaining value less than seven as it kills the microbes and helps activate the pepsin to digest the proteins.
The acidic nature of the gastric juice does not affect the stomach as the mucosa layer of the stomach secretes mucous and the if the cells get affected then the cells are repaired by the process of mitosis taking in the epithelial cells.
Thus, Option-B is the correct answer.
A. It forms a part of the upper atmosphere known as the ozone layer.
