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The immune system fights off the pathogen by Leukocytes also known as white blood cells. When a pathogen enters the body the immune system becomes alert to it and sends out sends out the Phagocytes (a type of Leukocytes) which engulfs the pathogens.
Answer: Stress can cause damage to the stomach by increasing the acid in the stomach, which results in indigestion.
Explanation: Hope this helps if not lemme know
I'm pretty sure (D) is the right answer
