It would crash into the sun because it would lose the speed it needs to orbit past it
Nina fighting the flu would be an example of "Innate" immunity. Innate immunity is a non-specific immunity that fights antigens that enter the body by producing chemical effects, skin barriers and immune system responses.
I would assume gallstones, if gallstones are found then they should be concerned.
Aerobic exercise greatly help prevent cardiovascular diseases by regulating blood pressure, preventing plaque buildup in the arteries, protects the arteries, promotes your body to create new small arteries in the heart and makes clots less likely to occur. According to recent research, exercise aids the muscles and fat cells to release chemicals that produce healthy changes through the blood and into organs.