Unit 7B- part 2

2. fossils found in ___ layers are more similar to each other than fossils found in layers above/below them
7. the geographical distribution of organisms
10. study of embryo development
14. true or false- fossils have been found deep in the rock strata that resemble organisms alive today
15. Darwin believed that evolution is a very ____ (fasts/slow) process that it cannot be observed
16. ____ equilibrium- occurs when organisms change very quickly due to new niches opening up, or an organism becomes isolated
17. event in which all of a species ceases to exist
18. because of similar selection pressures, different organisms evolved ____ features
20. organs that are remnants of a previous ancestor and serve no function in the current organism

1. there have been ____ mass extinctions according to evolution
3. ___ evolution occurs when two closely related species become more dissimilar over time
4. ____ evolution is when two unrelated organisms evolve the same
5. ____ fossils have features that are intermediate of the organisms that came before and after them
6. all green plants have the same type of ____- evidence that they all came from a common plant ancestor
8. body parts that are similar in structure but different in function
9. occurs when two organisms evolve together
11. ___ extinctions are due to natural selection
12. ____ radiation is the sudden appearance of many new organisms
13. ___ teeth are a vestigial organ in humans
19. ___ extinctions are due to a catastrophic event (meteor)