Yes Darwin’s theory of natural selection
B.To Understand group behavior through observation
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.
Resonance is the quality of the voice that is produced from sound vibrations in the pharyngeal, oral, and nasal cavities.
Hope this helped, have a great day! :D