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2. 1 One species evolves into another through the process of ______.

3. 1 Speciation Home

4. 2 A group of similar organisms that can mate with one another to produce fertile offspring is a _______.

5. 2 Species

6. 3 Something that helps an organism survive better in its environment is known as a ______.

7. 3 Adaptation

8. 4 _____ is the process by which populations change over time.

9. 4 Evolution

10. 5 In ____, humans select traits that will be passed from one generation to another.

11. 5 Selective Breeding

12. 6 A change in a gene at the DNA level is called a ______.

13. 6 Mutation

14. 7 _____ are commonly found in sedimentary rock.

15. 7 Fossils

16. 8 A human’s arm, a cat’s front leg, a dolphin’s front flipper and a bat’s wing have similar kinds of ____.

17. 8 Bones

18. 9 Remnant structures of once useful structures are known as ______.

19. 9 Vestigial Structures