Distinguish between the following: Prostomium and peristomium.

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Prostomium Peristomium
$1$. It is a small,fleshy,lobe-like structure that overhangs the mouth of an earthworm. $1$. It is the first body segment of the earthworm,also known as the buccal segment.
$2$. It acts as a wedge to force open cracks in the soil and is sensory in function. $2$. It surrounds the mouth opening and contains the mouth.

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