If blood is too acidic, one way for the body to maintain homeostasis is by secreting Hydrogen ions into the nephron from the blood not reabsorbing Hydrogen ions into the blood all of these o lowering the pH of urine

What evidence for the age of the earth is indicated by the fact that sedimentary rock is found on mountain tops? that the earth has expanded outward from water beds that mountains formed first before anything else that some force lifted the rocks from the water the earth is not very old and has not had time for many rock layers to form