Chordate Features
Chordates are grouped together because at some time in their life cycle they possess the following 3 features.
First, all chordates have a dorsal supporting cord (notochord).
Second, all chordates have a dorsal nerve cord.
Third, all chordates have gill slits.
Although these 3 features are present in all young or developing chordates, in most adult species they are altered or absent.
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