Before your food passes from the mouth and down your esophagus, salivary amylase, an enzyme in saliva, begins to digest the starch in your bread. That is the start of chemical digestion. ... The passage of the bolus through the esophagus to the stomach occurs by peristalsis, a series of wave-like muscle contractions.
Answer:
I want to say pump blood to the lungs and body
Explanation:
Carbon Dioxide contributes the most to the greenhouse effect
It has a neutral PH and is polar (necessary for how living tissues react with one another)
