Fossil Record & Biogeography

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Across
  1. 2. The super continent that broke up into Laurasia and Gondwana.
  2. 5. Remains or traces of an organism that once existed.
  3. 6. The process by which organic materials become preserved as fossils, often turning into rock over time.
  4. 7. The process by which continents were separated causing organisms to become geographically isolated.
  5. 9. An important transitional fossil displaying features of both birds and reptiles.
  6. 11. A single ancestral species evolves into many different species as they adapt to different environments
  7. 12. The cumulative collection of fossils and their placement in rock formations, documenting the history of life.
Down
  1. 1. Existing species of ancient lineages that have not changed in form for a very long time.
  2. 3. The study of how continents move across the Earth, and how this directly affects the location of organisms.
  3. 4. The time it takes for half the radioactivity to decrease.
  4. 8. The fossilised remains of a life form that has traits common to two ancestral groups
  5. 10. Uses the amount of radioactivity remaining in the rock surrounding the fossil to determine its age.