You are given the task of confirming the categorization of a newly discovered animal that has been tagged as a species of annelid. what evidence would convince you that it is indeed an annelid and not a roundworm or flatworm?

The evidence would be body segmentation.

Segmentation is a unique characteristic of annelids. The annelids exhibit a highly developed interior segmented circulatory system, which permits for effective flow of blood to the muscles and to the critical systems of the body like a circulatory system that supports the organs like the heart. In the absence of segmentation, the annelids would find it difficult to do locomotion in the diverse surroundings.