| 11. | The key covers gymnosperms and angiosperms and was designed for field use.
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| 12. | Details of the process vary according to the division of gymnosperms in question.
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| 13. | Two main modes of fertilization are found in gymnosperms.
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| 14. | It is found in both gymnosperm and angiosperm plants.
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| 15. | Genetic studies have shown this was when angiosperms separated from cycads and gymnosperms.
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| 16. | And some of the gymnosperm families have been revised.
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| 17. | True gymnosperms and zygopterid ferns also formed shallow rooting systems during the Famennian.
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| 18. | The type of tree is important with deciduous angiosperms strongly preferred to gymnosperms.
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| 19. | And about 650 are gymnosperms, which are trees with cones, like evergreens.
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| 20. | All gymnosperms and many angiosperms are woody plants.
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