The first segment of the earthworm is called:

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(B) The body of the earthworm is divided into many segments called metameres. The first segment of the earthworm is known as the $Peristomium$ (or buc

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Peristomium

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(B) The body of the earthworm is divided into many segments called metameres. The first segment of the earthworm is known as the $Peristomium$ (or buccal segment). It contains the mouth. $Clitellum$ is a glandular,non-segmented part found in segments $14-16$. $Nephridia$ are the excretory organs found in almost all segments.

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