this would be d) the atmosphere : p
my hotdog is jiggly bruh no kap
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.
. an author wants to identify why an event occurred and...