Change Over Time

1. Synonyms for strata.
7. Nature selecting traits by "survival of the fittest".
9. A feature that an organism inherited from an ancestor but is no longer used.
10. Things shared by organisms we think are closely related.
12. Naturalist/Scientist that developed the theory of evolution.
16. The number of ways plant and animal cells are different.
17. Fossils or organisms that show the intermediate between today's creatures and their old relatives

2. Using radioactive decay (change) in atoms to give an exact date to something.
3. Population of organisms that we actually watch change in terms of color variety in response to their environment and predators.
4. A group of the same type of organism that can breed and produce offspring.
5. Similar characteristics in new and old species due to relatedness.
6. Important to survival of a species so when the environment changes, some of the species can still survive.
8. Humans selecting traits in organisms like dogs and food crops.
11. The homology that every form of life has. It may link everything!!
12. An example of a vestigial feature in dogs. We think that they were once actually used as toes.
13. Figuring out age of rock and fossils by position in rock strata.
14. Baleen whales may have once had these as adults. Now only the fetus has them and then they disappear.
15. evidence Used to show that life is old and has changed over time.
16. The body part of horse relatives that seems to have changed over time.