Question

sheri often has colds. which behavior can sheri include in her life to boost her immune system? quitting smoking avoiding the sun drinking more orange soda sleeping less each night

Explanation:

Smoking weakens the immune - system. Quitting smoking can help improve immune function. Avoiding the sun can lead to vitamin D deficiency which may harm the immune system. Orange soda is high in sugar which can be bad for immunity. Sleeping less impairs immune - cell function.

Answer:

quitting smoking