Final answer:
H. pylori survives in the acidic stomach environment by producing urease, which breaks down urea into ammonia and raises the pH of the environment.
Step-by-step explanation:
H. pylori, a bacterium found in the stomach, is able to survive the acidic environment by producing urease and increasing the pH. This enzyme breaks down urea into ammonia and carbon dioxide, which raises the pH of the immediate environment to a nearly neutral level. The production of ammonia helps H. pylori create a more hospitable microenvironment in the stomach.