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OpenStudy (anonymous):

which were among the first plants to have a system inside their bodies that is used to carry water and nutrients

OpenStudy (anonymous):

@whitesamurai907 I assume by system you are referring to a true lignified vascular system. It is the Tracheophyta, basically ferns, clubmosses, ferns, horsetails, gymno- and angiosperms. http://en.wikipedia.org/wiki/Vascular_plant

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