Evolution Crossword

2. / Proposes that life forms can survive the effects of space and become trapped in debris ejected into space
4. / This is the study of the distribution of life forms over territories and continents
9. / This is the comparison of different animals in various stages of embryonic development
11. / This is the theory of the change in characteristics of populations over several generations

1. / An example of this structure is the human appendix
3. / This theory of the origin of life involves the idea that the chemicals combined in the ocean of the early Earth
5. / These are accidental changes in the DNA sequence
6. / These are similar structures found in more than one species that share a common ancestor
7. / This states that the organisms most adapted to the environment survive and reproduce
8. / Deep volcanic outlets with extreme temperature
10. / This field can tell us many similarities among species through the record of DNA
12. / This evidence of Earth's changing life involves the remains of lifeforms found in many layers of rock sediment