"Are They Among Us" Crossword

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Across
  1. 1. it is harder to identify different organisms in ______ stage embryos
  2. 3. scientists look for similar _______ structures or features to make cladograms
  3. 4. what came first? The chicken or the egg (pg18)
  4. 5. ________ body organisms decompose
  5. 10. the _______ layers of Earth have the older fossils
  6. 11. the process of bringing back an extinct species is de-______________
  7. 12. ___________ dating gives us the approximate age of fossils
Down
  1. 2. ____________ dating provides the exact age of fossils
  2. 6. Paleontologists study fossils
  3. 7. a _________ is a model of what organisms are related
  4. 8. the lower the percentage, the _______ the fossil
  5. 9. only fossils of sharks are from their bone _______