You are in college and u don't know this
If the Plate Tectonics stopped moving <span>the continents would stay in place rather than moving slowly around the face of the earth. This would also cause volcanic activity and earthquakes.</span>
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Answer alveoli and blood vessels
The respiratory bronchioles have single alveoli off their walls. ... The respiratory bronchioles lead into alveolar ducts, (which are surrounded by smooth muscle, elastin and collagen), which lead into the alveolar sacs. These have several alveoli, surrounded by blood vessels - from the pulmonary system.
Explanation:
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