| 1. | | process by which populations of organisms with variations that help them survive in their environments live longer, compete better, and reproduce more than those that do not have the variations |
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| 2. | | inherited trait that increases an organism's change of surviving and reproducing in its environment |
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| 3. | | body parts of organisms that are similar in structure and position but different in function |
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| 4. | | slight difference in an inherited trait of individual members of a species |
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| 5. | | study of similarities and differences among structures of living things |
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| 6. | | an adaptation that enables a species to blend in with its environment |
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| 7. | | body parts that perform a similar function but differ in structure |
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| 8. | | atoms of the same element that have different numbers of neutrons |
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| 9. | | science of the development of embryos from fertilization to birth |
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| 10. | | chart that divides the Earth's history into different time units |
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| 11. | | body parts have lost their original function through evolution |
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| 12. | | occurs when the last individual organism of a species dies |
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| 13. | | a person who studies plants and animals by observing them |
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| 14. | | change over time in populations of related organisms |
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| 15. | | made up of all the fossils ever discovered on Earth |
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| 16. | | breeding of organisms for desired characteristics |
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| 17. | | preserved evidence of the activity of an organism |
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| 18. | | resemblance of one species to another species |
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| 19. | | a fossil copy of an organism in a rock |
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| 20. | | impression of an organism in a rock |
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| 21. | | to overcome by argument |
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