Answer: The “graying of America”
Explanation: Just took the test
Answer: Its velocity was 20 km/s southward.
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When you swallow food, it doesn't just drop down into your stomach. Muscles contract in a wave-like motion to move the food along through the esophagus. This muscle movement is called, peristalsis, or peristaltic waves. These peristaltic waves contract behind the food bolus pushing it along the digestive tract.
C because a lesion is high density