Chordate

... at that time. ...not only the phylum Chordata itself, but also all its major divisions, arose within the Cambrian Explosion. So much for chordate uniqueness... Contrary to Darwin's expectation that new data would reveal gradualistic continuity with slow and steady expansion, all major ...

See entire post

... at that time. ...not only the phylum Chordata itself, but also all its major divisions, arose within the Cambrian Explosion. So much for chordate uniqueness... Contrary to Darwin's expectation that new data would reveal gradualistic continuity with slow and steady expansion, all major ...

See entire post

first of all, the opposite of invertebrate is not vertebrate, it is chordate. I would think arthropods would be a better opposite.

See entire post

first of all, the opposite of invertebrate is not vertebrate, it is chordate.

See entire post

... do not loose their notocord " but I checked this in my Campbell bio text book and it says "the adult tunicate scarcely resembles a chordate. It displays no trace of a notochord , nor is there a nerve cord or tail. Only the pharyngeal slits suggest a link to other chordates. But ...

See entire post