Evolution

1. Another word for trait or characteristic.
3. The study of anatomy used to support evolution.
5. The gradual change of a species over time.
6. The ancestor that two or more descendants have in common.
8. A group of living organisms consisting of similar individuals.
9. A naturalist who studied organisms on the Galapagos Islands during the 1800's. Developed the theory of natural selection.
11. Remnants of organs or structures that had a function in an early ancestor.
13. The arrangement of something's shape or form.
16. The steady, gradual process of developing.
18. The study of Earth and it's changes over time.
19. Similar in function, but differ in structure. Does not support common ancestry.

1. Prehistoric remains or impressions of deceased organisms. Classified as preserved, petrified, mold, cast, and trace.
2. Similar in structure, but differ in function. May show common ancestry.
4. Species do this through evolution to better survive in their environment.
7. The plural term for a period of ten years.
10. Based on observation or experience.
12. The individual pieces that make up the skeleton. Known widely to consist of calcium.
14. The study of embryos used to support the theory of evolution.
15. The genetic "building blocks" of living things.
17. An individual animal, plant, or single-celled life form.