You find a small, elongated animal embedded in the sand with one end sticking out. Among other things, it has segmental musculature, a coelom, a notochord, and a complete digestive tract with an anus located partway down the body. This animal is

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Quizplus · Accepted Answer

The presence of a notochord and a complete digestive tract with an anus are traits characteristic of chordates. An annelid would have a segmented body, but it would lack a notochord, which is a defining feature of chordates. A larval echinoderm would not have a notochord or a complete digestive tract with an anus. Therefore, the best choice is D, a chordate.

You Find a Small, Elongated Animal Embedded in the Sand