Evolutionary History

3. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
6. a trait that makes it more likely that an individual will survive in a specific environment
10. s group of organisms of the same kind (in one or more poulations) that do not reproduce with organisms from any other group
12. a group of individuals born and living at about the same time
17. the process by which the distribution of traits in a population changes over many generations
19. to classify based on scientific examination
20. when something stays mostly the same over time
22. living things, such as plants, animals, and bacteria
23. the process by which species adapt to environmental changes over a very long time
24. a graph that uses bars to show how characteristics or values are distributed within a group
25. to receive genes from a parent
26. the process by which one population evolves into two or more different species

1. an older population from which two or more newer species descended
2. a body structure in two or more species that features the same parts (for example, the same bones)
4. a group of the same type of organism living in the same area
5. a more recent species that evolved from an ancestor population
7. a specific characteristic of an individual organism
8. an organism's arm, leg, or wing
9. a scientist who studies fossils in order to understand the ancient history of life on Earth
11. a part of an organism (for example, one or more bones)
13. having died out completely and no longer alive anywhere on Earth
14. sharing a common ancestor population
15. a random change to a gene that sometimes results in a new trait
16. everything (living and nonliving) that surrounds an organism
18. the very long time that spans the history of Earth, from the very first cellular life to the present
21. a related organism from a previous generation