Answer:
The muscularis externa layer
Explanation:
The muscularis externa layer has three layers of muscle. An innner oblique layer , a middle circular and an external longitudinal layer. The contraction of these muscle layers help to break up the food mechanically.
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A
you could change the fact that it ever existed.
Cognitive is your answer.
Answer: Yes the ozone layer sits at the top to protect us from harmful UV rays from the sun.
