Many nonchordates have tails. which feature differentiates a chordate's tail from that of a nonchordate?

Some unique characteristics of the chordata are the following: Notochord is present, Dorsal hollow nerve cord is present,paired pharyngeal gill slits are present, and post anal tail is present. The differences in Nonchordates are the following: Notochord is absent, Solid nerve cord generally ventral/lateral, post anall tail is absent, pharyngeal gill slits are absent, Dorsal hear.

A) Chordates have postanal tails.

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