Answer: to fight against foreign antigens
Explanation: lymphocytes is a type of white blood cell that helps fight against invaders or foreign body in our body system. They are found mostly on the lymph and blood
There are basically two types of lymphocytes;
T lymphocytes- It develops from the thymus and Its functions by identifying intruders and then respond by eliminating them.
B cell or lymphocytes develop from the bone marrow hence the name B cell. It functions by creating some antibodies that destroy the effect of invaders that causes adverse effect.
There are many fish and other large marine animals in the light zone becuse plankton (a main foodsource for many fish) is able to grow.
Provide organs and muscles with the oxygen they need to function
