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Answer:
Gravity
Explanation:
It can settle down and separate over time due to gravity.
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The alveoli are surrounded<span> by tiny blood vessels, called capillaries. The </span>alveoli<span> and capillaries both have very thin walls, which allow the oxygen to pass from the </span>alveoli<span>to the blood. The capillaries then connect to larger blood vessels, called veins, which bring the oxygenated blood from the lungs to the heart.</span>
Answer:
Model
Explanation:
A model of anything is something you make to represent it in it's physical world form
