Answer:
Explanition:
The immune system is made up of special organs, cells and chemicals that fight infection (microbes). The main parts of the immune system are: white blood cells, antibodies, the complement system, the lymphatic system, the spleen, the thymus, and the bone marrow.
Digested food broken down in the small intestine is the size of molecules and can now pass through the villi into the blood stream<span> through the process of diffusion. </span>
Answer: A. White Blood Cells
Explanation: