How does the bone protect the immune system?

please help

The bone marrow(which is found in bones) produces cells called lymphocytes which is an essential part to the immune system. The lymphocytes circulate in your blood, and there are 2 types of lymphocytes: T and B cells. The B cells produce molecules that destroy viruses or bacteria

the answer is c.) there is a warm front in region a and a stationary front in region b.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high