8th Grade Topic 5 Natural Selection Vocab

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Across
  1. 1. well-tested explanation
  2. 5. record fossils that have been discovered and what scientists have learned from them
  3. 7. elationship in which one organism lives inside another organism’s cells
  4. 8. made of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur
  5. 9. term describing a group of related organisms that has died out
  6. 10. struggle between organisms to survive using same resources in the same area
  7. 12. natural process by which something takes place
  8. 13. inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment
  9. 14. how well an organism can survive and reproduce in its environment
Down
  1. 2. two species evolve in response to changes in each other over time
  2. 3. young organism that develops from a zygote
  3. 4. group of similar organisms that can reproduce
  4. 5. preserved remains or traces of an organism that lived in the past
  5. 6. modern organisms descended from ancient organisms
  6. 11. organisms that are best adapted to their environment are most likely to survive and reproduce