Enter the intriguing world of ""naked seeds"" -- Gymnosperms were the first seed-producing plants with seeds exposed rather than enclosed in an ovary or fruit. -- This video looks at the history, structures, and functions of the four classes of these intriguing plants: conifers, cycads, gingkos, and gnetails. -- It follows the life cycle of a pine and details the habitats and importance of the most familiar gymnosperms, the conifers. Grades 7-12. 29 minutes. -- Includes: teacher's guide.

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