Evolution

3. scientific theory that nonliving matter evolved into living organisms through a series of chemical reactions.
5. these were the first organisms
7. branching tree diagram that shows ancestral relationships among organisms.
12. movement of alleles from one population to another.
13. similar structures that related species have inherited from a common ancestor
15. concept in biology that states that all species have descended from a common ancestor.
16. naturalist that journeyed around the world making observations that led to the theory of evolution
17. change in allele frequencies due to chance
18. this cell structure is believed to have once been a living prokaryotic cell

1. organisms that survived without oxygen.
2. phenomenon in which individuals choose their mates based on their genotypes or phenotypes.
4. changes in the DNA sequence of an organism that occur during DNA replication
6. the two last names of the men that conducted an experiment about where living things came from
8. theory of how prokaryotes evolved into eukaryotes
9. process by which organisms that are better adapted to their environment are more likely to survive and reproduce
10. remains or imprints of organisms from earlier geological periods preserved in sedimentary rock
11. ancestor that is shared by different species.
14. every offspring produces more than can possibly survive