Which best describes the top and bottom images of muscle contraction? mc023-1.jpg mc023-2.jpg a. the top image is in step 2, and the bottom image is in step 1. b. the top image is in step 1, and the bottom image is in step 3. c. both images are in step 1. d. both images are in step 3.

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.