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Explain when seed plants first appeared and how gymnosperms became the dominant plant group.
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- What are the four modern-day groups of gymnosperms?Which of the following traits characterizes gymnosperms? a. The plants carry exposed seeds on modified leaves. b. Reproductive structures are located in a flower. c. After fertilization, the ovary thickens and forms a fruit. d. The gametophyte is longest phase of the life cycle.Give one significant difference between gymnosperms and angiosperms.