Across
- 5. A type of fossil where the organism becomes trapped in tree sap that eventually hardens
- 7. The process in which humans select for specific traits
- 12. The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope
- 13. One of the oldest, most complete hominid fossils found showing bipedal locomotion (walk on two legs)
- 15. Structures that have no current function
- 16. One driving force behind the mechanism of evolutions that provide variation amongst a species are random ____________.
- 17. Proposed the theory of evolution by natural selection
- 18. A characteristic that improves an individual's ability to survive and reproduce in a particular environment
- 20. Preserved remains of ancient organisms
Down
- 1. A difference or deviation (e.g. in structure, form, function) from the recognized norm or standard.
- 2. Change over time (specifically genetic change)
- 3. The process by which organisms that are better adapted to their environment survive and reproduce more successfully than less well adapted organisms
- 4. Structures that have similar anatomy but different function
- 6. A group of organisms that are closely related and can mate to produce fertile offspring
- 8. A way of dating fossils by comparing their location in the dirt and rock strata
- 9. More offspring are produced than can actually survive
- 10. A type of fossil that shows the activity of an organism
- 11. The process by which organisms that are better adapted to their environment survive and reproduce more successfully than less well adapted organisms
- 14. Structures that have similar function, but different anatomy
- 19. Explains the "why" behind a large body of facts