key concept 28.1 Pollen, Seeds, and Wood Contributed to the Success of Seed Plants
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Features of the seed plant life cycle protect gametes and embryos
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The seed is a complex, well-protected package
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A change in stem anatomy enabled seed plants to grow to great heights
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key concept 28.2 Once Dominant Gymnosperms Still Thrive in Some Environments
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There are four major groups of living gymnosperms
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Conifers have cones and lack swimming sperm
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key concept 28.3 Flowers and Fruits Led to Increased Diversification of Angiosperms
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Angiosperms have many shared derived traits
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The sexual structures of angiosperms are flowers
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Flower structure has evolved over time
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Angiosperms have coevolved with animals
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The angiosperm life cycle produces diploid zygotes nourished by triploid endosperms
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Fruits aid angiosperm seed dispersal
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Recent analyses have revealed the phylogenetic relationships of angiosperms
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key concept 28.4 Plants Play Critical Roles in Terrestrial Ecosystems
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Seed plants have been sources of medicine since ancient times
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Seed plants are our primary food source
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Apply What Youâve Learned
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