What is NOT kept constant by a homeostatic mechanism?

Which enzymes break down carbohydrates?

To test the responsiveness of the kidneys, scientists have designed an experiment tracking urine output of people during a normal day, while regulating the in-take of water by mouth. what would be an appropriate hypothesis for this experiment?

Support mangrove trees out of the water. a) pneumatophores b) prop roots c) sand dunes d) tide supports