17. Which of the following are the main ideas that Darwin advanced in his works?

        a. species change over time

        b. living species have arisen from earlier life forms

        c. the earth is approximately 6,000 years old and is unchanging

        d. both a and b are correct answers

Darwin was influenced by the work of Lyell, a geologist, that proposed a very ancient planet earth that was continually changing.

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Emma Erdahl, Associate Professor of Biology
Northern Virginia Community College
Revised 8/23/00