evolution relearn

3. dating -A technique used to determine which of two fossils is older
4. the preserved remains or traces of an organism that lived in the past
5. tree -a diagram showing how scientists think different groups of organisms are related.
8. - the gradual change in species over time
9. -the theory that evolution occurs slowly but steadily
11. - any different between individuals of the same species
12. equilibrium -The theory that species evolve during short periods of rapid change.
16. dating -process where scientists look at the half-life of chemical contained in rocks around a fossil to determine the age of fossil
20. Darwin-British nationalist who formulate the theory of evolution by natural selection
21. fossil -a fossil formed when minerals replace all or part of an organism
22. link -gaps in the fossil record
23. - a type of fossil that forms when a mold become filled within mineral that then harden

1. - a type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part.
2. - any change of DNA in the organism
6. structure -similar structure that related species have inherited from common ancestor
7. selection-a process by which individuals that are better adapted to their environment are more likely to survive and reproduce than others that are not
10. - behavior or physical characteristic that allows an organism to survive and reproduce in its environment
13. theory -a well-tested concept that explains a wide range of observations
14. - the disappearance of all members of a species from earth
15. -the time it was ages for half of atoms in a radioactive element to decay
17. - that variety of organisms that inhabit the earth
18. a group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce
19. recorder -the million fossil that scientist have collect