• The phylum Chordata consists of both invertebrate and vertebrate chordates.
  • Chordates include vertebrates and invertebrates that have a notochord.
  • They also have a post-anal tail, dorsal hollow nerve cord, and pharyngeal slits.
  • In humans, these four traits are present only during the embryonic stage.
  • After that, some of the traits disappear or develop into other organs.Adult humans lack some of these defining traits of the chordate phylum.
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