Which of the following processes returns carbon from this vast reservoir to the active carbon cycle? ( more than one answer may be right) a. burning fossil fuels b. sedimentation c. photosynthesis d. decomposition of dead organisms

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.