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FOOD THAT WE EAT STICKS TO OUR TEETH WHERE GERMS LIVE ON IT. AS THE GERMS FEED , THEY PRODUCE ACID THAT CAN WEAR HOLES , OR CAVITIES , IN OUR TEETH .
THERE ARE THREE MAIN PARTS OF THE EAR THAT WORK TOGETHER TO MAKE US HEAR . THE OUTER EAR COLLECTS SOUND FROM THE AIR . THE MIDDLE EAR MAKES THE SOUND FROM THE AIR . THE MIDDLE EAR MAKES THE SOUND LOUDER INSIDE OUR HEAD . FINALLY , THE INNER EAR CHANGES THE SOUND INTO SIGNALS THAT GO TO THE BRAIN. |
