Image result for Is work done when you carry a book across the room at a constant velocity
Work is not done when you carry an object forward. You may have learnt that carrying an object and moving horizontally at a constant velocity has no work done. The truth is, there is a slight amount of work done due to overcoming air resistance in the horizontal direction.
C applies as the kidney must excrete salt in order to get rid of excess water. (Water chases salt) if there is too much salt in the body the urine will be much more concentrated then if the body had too much water. Glucose may kbly be excreted if there are problems with the kidney- some diabetics pee out glucose. D applies to some degree- salt will still be excreted but in very dilute amounts- as the water must chase something in order to be excreted.
Answer
cutting or incision
for example: gastrotomy means a surgical incision to the stomach
