Well you haven't provided any answer options so answer options include things like mountain climbing. Mountain climbing involves multiple systems and functions over a long period, with moderate being something like hiking the same mountain.
I think C but I might be wrong
Answer:
A communicable disease is one that is spread from one person to another through a variety of ways that include: contact with blood and bodily fluids
Explanation:
The answer is B. celiac disease. Celiac disease is an immune disorder. When someone with the disease eats any food containing gluten, the immune system creates antibodies and gets rid of the gluten but at the same time attacks the small intestine.
