Concept
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Characteristics of Chordata
Defining characteristics of chordates
In chordates, four common features appear at some point during development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Chordates. October 17, 2013."
http://cnx.org/content/m44685/latest/Figure_29_01_02.png
OpenStax CNX
CC BY 3.0.