Observe it. I would observe the features of it, and research it
Answer:
Explanation:
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the San Andreas fault, site of many earthquakes in California
The right side of the heart sends blood out to the lungs to become oxygenated and that oxygen-rich blood comes back to the heart on the left side. Then the left side of the heart pumps the oxygenated blood to the rest of the body.
T cells signal B cells to adjust the pH of the blood. would be correct i believe.
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