Which of the four layers of the wall of the a | vedclass

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(D) The wall of the alimentary canal consists of four layers: $Serosa$,$Muscularis$,$Submucosa$,and $Mucosa$.$1$. $Serosa$ is the outermost layer and

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Mucosa

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(D) The wall of the alimentary canal consists of four layers: $Serosa$,$Muscularis$,$Submucosa$,and $Mucosa$.$1$. $Serosa$ is the outermost layer and is made up of a thin mesothelium with some connective tissues.$2$. $Muscularis$ is formed by smooth muscles usually arranged into an inner circular and an outer longitudinal layer.$3$. $Submucosa$ consists of loose connective tissues containing nerves,blood,and lymph vessels.$4$. $Mucosa$ is the innermost lining of the lumen of the alimentary canal. It shows significant modifications and variations in different parts of the digestive tract,such as the formation of rugae in the stomach and villi in the small intestine,to increase surface area and facilitate secretion and absorption.

Which of the four layers of the wall of the alimentary canal shows the most variation?

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