Life Over Time Review

5. An ancestral species from which later species evolved
11. the water, topography, and vegetation of an area or region
12. a favorable genetic variation that helps an organism blend in with its environment
15. a fossil in which minerals replace all or part of an organism
17. The preserved remains or traces of an organism that lived in the past
19. Chronological collection of life's remains in sedimentary rock layers
20. The struggle between organisms to survive in a habitat with limited resources.
21. A characteristic that an organism can pass on to its offspring through its genes.
22. A trait that helps an organism survive and reproduce
23. All the different populations that live together in an area
24. An environmental factor that prevents a population from increasing
26. different types of genes in a population, resulting in different traits among individuals of the same species

1. A term that typically describes a species that no longer has any known living individuals.
2. fossil remains of organisms in tar, amber, or ice
3. The gradual change in a species over time
4. A group of individuals that belong to the same species and live in the same area
6. Living things and byproducts of living things
7. an animal that hunts other animals for food
8. An interaction in which one organism captures, kills, and feeds on another organism.
9. A natural process resulting in the evolution of organisms best adapted to the environment.
10. an organism that is killed and eaten by another organism
13. selective breeding of plants and animals to promote the occurrence of desirable traits in offspring
14. A biological community of interacting organisms and their physical environment.
16. a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
18. a random error in gene replication that leads to a genetic variation
25. Non-living things