Science

2. the process by which unrelated organisms evolve
4. scientific ta trait that increases an organism's ability to survive
7. a trait that the common ancestor had
11. the process by which individuals that are better adapted to their environment
12. involves small changes that add up to major changes over a long period of time
13. a group of similar organisms that can mate with each other

1. species evolve during short periods of rapid change and then don't change much
3. any difference between individuals of the same species
5. the preserved remains of an organisms
6. diagram that shows probable evolutionary relationships
8. similar structures that related species have inherited from a common ancestor
9. the process of change over time
10. a well-tested concept that explains a wide range of observations