The horsetails and ferns are members of a single clade, the

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The horsetails and ferns belong to the clade Monilophytes, also known as the ferns and fern allies. The other options are incorrect: A) Lycophytes includes club mosses and quillworts but not horsetails or ferns, B) Streptophytes includes land plants and some green algae, but again not horsetails or ferns, C) Euphyllophytes includes all vascular plants with true leaves, such as ferns, seed plants, and flowering plants, but does not include horsetails, and E) Bryophytes includes mosses, liverworts, and hornworts, which are nonvascular plants, and therefore also do not include horsetails or ferns.

The Horsetails and Ferns Are Members of a Single Clade