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Chemistry 13 Online
rxcklesskaisher:

Vertebrates, or chordates, at some point in their life cycle, all have: a backbone all of the above slits in the throat area notochord and a nerve cord

aaronlloyd:

the bottom one is the answer

rxcklesskaisher:

@aaronlloyd wrote:
the bottom one is the answer
thank you so much :)

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