Can you expand on the question?
Answer:
They convert glucose into usable energy.
Explanation:
The total amount would be 19cm. this is because you add 9+4+6.
Answer:The esophagus is a muscular tube connecting the throat (pharynx) with the stomach. The esophagus is about 8 inches long, and is lined by moist pink tissue called mucosa. The esophagus runs behind the windpipe (trachea) and heart, and in front of the spine.
Explanation: