Humans can prevent erosion by practing conseraviton

Which of these is the muscular tube that leads from the mouth to the stomach? a.epiglottisb.uvulac.soft palated.esophagus

What is the hormone in your brain that makes you feel happy?

Which example is a indication of stress a. becoming more alert b. narrowing air passages c. slowing down if the heartbeat d. decreasing blood sugar with adrenaline