What determines where the CEJ is placed on the tooth?

The cemento-enamel junction (CEJ) represents the anatomic limit between the crown and root surface[2] and is defined as the area of union of the cementum and enamel at the cervical region of the tooth.

Explanation:

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the answer would be roots! roots are the parts of the plant that are underground, and that's how they'd anchor the plant. the stem is above the sol, which doesn't with anchoring. hope this !