Evolution

4. An organism that makes its own food.
5. The study of embryos.
9. Body parts that have a similar functions but not a similar structure.
11. A crack in the ocean floor that emits extremely hot, mineral rich water.
13. The field of biology that deals with classifying organisms.
14. Explains how mitochondria, chloroplasts, and other organisms in eukaryotic cells evolved.

1. An organism's ability to fight a disease.
2. Prokaryotes that make food by photosynthesis.
3. Body parts of different organisms that have a similar structure but have different functions.
6. An organism that feeds on other organisms.
7. The mass of gases that surrounds Earth.
8. An organism's ability to withstand the effects of a harmful agent.
10. The evolution of a new species from an existing species.
12. The process by which organisms best suited to their environment survive and reproduce.