Chemistry, 09.09.2019 21:10 skyefricke1139

This phylum includes the vertebrates, together with several closely related invertebrates. they are united by having, at some stage in their life, a notochord, a hollow dorsal nerve cord, pharyngeal slits and a muscular tail extending past the anus.

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This phylum includes the vertebrates, together with several closely related invertebrates. they are...