Read the sentence. Research has proven that smoking is bad for your health. The Centers for Disease Control and Prevention (CDC) has reported that smoking can double or even quadruple the risk of coronary heart disease. Which word or phrase should be added to clarify the relationship between the first and second sentences

between the two muscle layers is the myenteric or auerbach's plexus, which controls peristalsis. in the colon, the muscularis externa is much thicker because the feces are large and heavy, requiring more force to push along. the stomach has a third layer of muscularis externa: the inner oblique layer.

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let me look that up because idk but ill tell you the answer in 5 mins

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yes

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if i knew what u looked like

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im am not sure what you are asking. could you rephrase the question?