Answer: D. helps in digestion Explanation: Gastric juice in the stomach contains HCL which creates an acidic condition(pH1.5-2.0) which is optimal for the action of enzymes in the stomach. HCL stops the activity of salivary amylase & helps to kill bacteria in food. It doesn’t help in digestion cuz it is not an enzyme.
Well, right away I know that it is some sort of mutualistic relationship. Since this is not an option here, my best guesses are either <em>B or C.</em>
