Unit 7B- part 2

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Across
  1. 2. fossils found in ___ layers are more similar to each other than fossils found in layers above/below them
  2. 7. the geographical distribution of organisms
  3. 10. study of embryo development
  4. 14. true or false- fossils have been found deep in the rock strata that resemble organisms alive today
  5. 15. Darwin believed that evolution is a very ____ (fasts/slow) process that it cannot be observed
  6. 16. ____ equilibrium- occurs when organisms change very quickly due to new niches opening up, or an organism becomes isolated
  7. 17. event in which all of a species ceases to exist
  8. 18. because of similar selection pressures, different organisms evolved ____ features
  9. 20. organs that are remnants of a previous ancestor and serve no function in the current organism
Down
  1. 1. there have been ____ mass extinctions according to evolution
  2. 3. ___ evolution occurs when two closely related species become more dissimilar over time
  3. 4. ____ evolution is when two unrelated organisms evolve the same
  4. 5. ____ fossils have features that are intermediate of the organisms that came before and after them
  5. 6. all green plants have the same type of ____- evidence that they all came from a common plant ancestor
  6. 8. body parts that are similar in structure but different in function
  7. 9. occurs when two organisms evolve together
  8. 11. ___ extinctions are due to natural selection
  9. 12. ____ radiation is the sudden appearance of many new organisms
  10. 13. ___ teeth are a vestigial organ in humans
  11. 19. ___ extinctions are due to a catastrophic event (meteor)