Rank gymnosperm groups in order from the one with the lowest number of extant species to the one with the highest.

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Ginkgos have the lowest number of extant species, with only one species currently living. Gnetophytes have slightly more, but still relatively few species. Cycads have more species than ginkgos and gnetophytes, but fewer than conifers. Conifers have the highest number of extant species among gymnosperms, with thousands of species.

Rank Gymnosperm Groups in Order from the One with the Lowest