Evolution History

1. a group of individuals born and living at about the same time
4. a part of an organism (for example, one or more bones)
6. a more recent species that evolved from an ancestor population
9. the process by which one population evolves into two or more different species
11. the process by which species adapt to environmental changes over a very long time
12. an organism's arm, leg, or wing
14. the very long time that spans the history of Earth, from the very first cellular life to the present
18. to receive genes from a parent
19. an older population from which two or more newer species descended
20. a group of the same type of organism living in the same area
22. a related organism from a previous generation
23. a body structure in two or more species that features the same parts (for example, the same bones)
25. a scientist who studies fossils in order to understand the ancient history of life on Earth
26. evidence of life from the past, such as fossilized bones, footprints, or leaf prints

2. the process by which the distribution of traits in a population changes over many generations
3. a specific characteristic of an individual organism
5. having died out completely and no longer alive anywhere on Earth
7. a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group
8. when something stays mostly the same over time
10. sharing a common ancestor population
13. to classify based on scientific examination
15. a random change to a gene that sometimes results in a new trait
16. a graph that uses bars to show how characteristics or values are distributed within a group
17. a trait that makes it more likely that an individual will survive in a specific environment
21. living things, such as plants, animals, and bacteria
24. everything (living and nonliving) that surrounds an organism