Biology - chapter 22: Evolution.

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Across
  1. 4. Process by which individuals that are better suited to their environment survive and reproduce most successfully; also called natural selection
  2. 7. mutations
  3. 8. the diversification of a group of organisms into forms filling different ecological niches.
  4. 10. Formation of new species
  5. 11. The division of the Earth's history into a series of named units.
  6. 13. Process by which unrelated organisms independently evolve similarities when adapting to similar environments
  7. 16. Body parts that share a common function, but not structure
  8. 19. Structures in different species that are similar because of common ancestry.
  9. 21. competition among members of a species for food, living space, and the other necessities of life
Down
  1. 1. Pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
  2. 2. Process by which two species evolve in response to changes in each other
  3. 3. theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms
  4. 5. structure that is inherited from ancestors but has lost much or all of its original function
  5. 6. Ability of an organism to survive and reproduce in its environment
  6. 9. A trait that helps an organism survive and reproduce
  7. 12. A scientist who studies fossils
  8. 14. Diagram that shows the evolutionary relationships among a group of organisms
  9. 15. A term that typically describes a species that no longer has any known living individuals.
  10. 17. A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits.
  11. 18. principle that all living things were derived from common ancestors
  12. 20. English natural scientist who formulated a theory of evolution by natural selection (1809-1882)
  13. 22. The gradual change in a species over time