Life Over Time

2. The struggle between organisms to survive in a habitat with limited resources.
5. variation different types of genes in a population, resulting in different traits among individuals of the same species
6. The gradual change in a species over time
7. fossil a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
9. fossil a fossil in which minerals replace all or part of an organism
10. An interaction in which one organism captures, kills, and feeds on another organism.
12. selection A natural process resulting in the evolution of organisms best adapted to the environment.
13. selection selective breeding of plants and animals to promote the occurrence of desirable traits in offspring
16. Living things and byproducts of living things
20. an animal that hunts other animals for food
22. All the different populations that live together in an area
24. Factor An environmental factor that prevents a population from increasing
25. A group of individuals that belong to the same species and live in the same area
26. ancestor An ancestral species from which later species evolved

1. factors the water, topography, and vegetation of an area or region
3. an organism that is killed and eaten by another organism
4. A biological community of interacting organisms and their physical environment.
8. Non-living things
11. A trait that helps an organism survive and reproduce
14. record Chronological collection of life's remains in sedimentary rock layers
15. A term that typically describes a species that no longer has any known living individuals.
17. A characteristic that an organism can pass on to its offspring through its genes.
18. remains fossil remains of organisms in tar, amber, or ice
19. a favorable genetic variation that helps an organism blend in with its environment
21. The preserved remains or traces of an organism that lived in the past
23. a random error in gene replication that leads to a genetic variation