Life Over Time

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Across
  1. 2. The struggle between organisms to survive in a habitat with limited resources.
  2. 5. variation different types of genes in a population, resulting in different traits among individuals of the same species
  3. 6. The gradual change in a species over time
  4. 7. fossil a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
  5. 9. fossil a fossil in which minerals replace all or part of an organism
  6. 10. An interaction in which one organism captures, kills, and feeds on another organism.
  7. 12. selection A natural process resulting in the evolution of organisms best adapted to the environment.
  8. 13. selection selective breeding of plants and animals to promote the occurrence of desirable traits in offspring
  9. 16. Living things and byproducts of living things
  10. 20. an animal that hunts other animals for food
  11. 22. All the different populations that live together in an area
  12. 24. Factor An environmental factor that prevents a population from increasing
  13. 25. A group of individuals that belong to the same species and live in the same area
  14. 26. ancestor An ancestral species from which later species evolved
Down
  1. 1. factors the water, topography, and vegetation of an area or region
  2. 3. an organism that is killed and eaten by another organism
  3. 4. A biological community of interacting organisms and their physical environment.
  4. 8. Non-living things
  5. 11. A trait that helps an organism survive and reproduce
  6. 14. record Chronological collection of life's remains in sedimentary rock layers
  7. 15. A term that typically describes a species that no longer has any known living individuals.
  8. 17. A characteristic that an organism can pass on to its offspring through its genes.
  9. 18. remains fossil remains of organisms in tar, amber, or ice
  10. 19. a favorable genetic variation that helps an organism blend in with its environment
  11. 21. The preserved remains or traces of an organism that lived in the past
  12. 23. a random error in gene replication that leads to a genetic variation