Evolutionary History

2. a part of an organism (for example, one or more bones)
4. living things, such as plants, animals, and bacteria
6. the very long time that spans the history of Earth, from the very first cellular life to the present
9. a scientist who studies fossils in order to understand the ancient history of life on Earth population a group of the same type of organism living in the same area related sharing a common ancestor population
11. a related organism from a previous generation
16. a trait that makes it more likely that an individual will survive in a specific environment
17. a group of individuals born and living at about the same time
18. to receive genes from a parent
19. a body structure in two or more species that features the same parts (for example, the same bones)
21. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
22. the process by which one population evolves into two or more different species
23. having died out completely and no longer alive anywhere on Earth
24. everything (living and nonliving) that surrounds an organism

1. an older population from which two or more newer species descended
3. the process by which species adapt to environmental changes over a very long time
5. a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group
7. a random change to a gene that sometimes results in a new trait
8. a graph that uses bars to show how characteristics or values are distributed within a group
10. a more recent species that evolved from an ancestor population
12. to classify based on scientific examination
13. the process by which the distribution of traits in a population changes over many generations
14. an organism's arm, leg, or wing
15. when something stays mostly the same over time
20. a specific characteristic of an individual organism