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HRW BIO CRF Ch 01_p01-52

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Name Class Date<br />

Test Prep Pretest continued<br />

24. Why do scientists think that introns and exons contribute to evolutionary<br />

flexibility<br />

25. Describe the three ways that mutation can alter genetic material.<br />

Copyright © by Holt, Rinehart and Winston. All rights reserved.<br />

Holt Biology 20 How Proteins Are Made

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