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It is in orbit around the Sun.

It has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape.

It has not cleared the neighborhood around its orbit; and.

It is not a satellite (a moon)

Explanation:

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Protochordates are bilaterally symmetrical, triploblastic and have a coelom. In addition, they show a new feature of body design, namely a notochord, at least at some stages during their lives. The notochord is a long rod-like support structure (chord=string) that runs along the back of the animal separating the nervous tissue from the gut. It provides a place for muscles to attach for ease of movement. Protochordates may not have a proper notochord present at all stages in their lives or for the entire length of the animal.

Protochordates are marine animals. Examples are Balanoglossus, Herdmania and Amphioxus.

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