What role do the kidneys play in homeostasis?

I have already had this paper done by another writer from this website. my instructor has given me feedback on it in order to make changes. I will attach a copy of his feedback as a file. it is totally ok to copy and paste the part that are with no mistake since it is going to my final draft. Just please changes the part that are not right. Also I attach the instruction in case you need to look at it again. Explain the importance of tightly regulating plasma volume, osmolarity and pH. Why does it matter that homeostasis is maintained? What role do the kidneys play in homeostasis? What are the 3 processes that take place in the kidney leading to the formation of urine? Where, within the kidney, does ion and water regulation occur. Describe the role of the 3 hormones in regulation of urine composition and amount. Where are they released from, what do they do, and how are they regulated?