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.  

true is the final answer!