The diagram below represents part of the nephron. Use it to answer the questions that follow.
![diagran representing part of a nephron](https://www.easyelimu.com/images/form_3_past_papers/Term_1_2021/diagran_representing_part_of_a_nephron.JPG)
- Name the parts labelled A, B, C and D.
- Name the fluids found in C and D.
- Name the process by which the fluid found in D is formed.
- Mention one difference in the composition