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