I think it’s C but not precisely sure about it
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.
I believe it’s the sun
As the sun gives nutrients to the plant
Plant gets satin by animal
Animal gets eaten by animal and so on and the nutrients would be passed on
