Answer: tympanic membrane. also known as the eardrum
Explanation:
It’s gonna either be a or b or c I don’t really know most likely a
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.
Talk to a doctor, that’s what you should do