Answer:
I would say that the answer is A
Explanation:
Sorry if I get it wrong
Answer: C. Medulla and Cortex
The nephrons are found at the cortex-medulla junction. There are what we call as the juxtamedullary nephrons and cortical nephrons referring to their designated locations. The juxtamedullary nephrons are involved in the creation of concentrated urine of a person.
Well there are many but the surface of the earth is the material violin one outer core (if that makes sense