Its A. The adenoids and Tonsils. Adenoids are a patch of tissue thats high in the throat, directly behind the nose. They, along with the tonsils, are parts of the lymphatic system. In simple terms it helps stop infection and keep many body fluids in balance. They basically trap the germs that make their way through the mouth and nose. To add on, when the tonsils become inflamed either by taking too much germs or bacteria, thats what tonsillitis is. Hope this helps
A nephron is the functional unit of the kidney. it is the structure that produces urine which is the process of removing waste and excess substances from the blood. there are about 1,000,000 nephrons in each human kidney.
