Evolution Unit Crossword Puzzle

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Across
  1. 1. history of life in the geologic past presented by remains of once living things
  2. 5. inherited trait that helps an organism survive and reproduce in its environment
  3. 9. differences within a species
  4. 10. a rock that forms from compressed or cemented layers of sediment
  5. 12. organisms that are related and can mate to produce fertile offspring
Down
  1. 2. matter that settles to the bottom of a liquid or material deposited by water, wind, or glaciers
  2. 3. when every member of a species is dead
  3. 4. method used to determine the exact age of an object by comparing radioactive isotopes to stable isotopes
  4. 6. opinion proven by observation and scientific proof
  5. 7. the fossil remains of an organism that lived in a specific geologic age that is used to date the rock or rock layer it is found in
  6. 8. organisms that have advantageous traits and reproduce more successfully than others do
  7. 11. theory introduced by Charles Darwin...inherited characteristics within a species