Which of the Following Statements Is TRUE for Cycads and Ferns

question 138

Multiple Choice

Which of the following statements is TRUE for cycads and ferns, but not for conifers or ginkgo?

• A)Their extant diversity consists of a reduced set of "relict species" that have survived the appearance of the angiosperms by growing in environments where angiosperms do not have a clear advantage.
• B)Their extant diversity is confined to the same environments in which their peak historical diversity once existed.
• C)Their diversity has increased due to recent radiations into new environments, such as modern tropical rain forests created by angiosperms.
• D)Their total diversity has declined since its peak, even as the extant diversity consists of recent radiations coinciding with the diversification of angiosperms.

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