Biology

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Across
  1. 7. Evolution that occurs in response to another species, driving a special relationship between two species.
  2. 9. The exctintion of a species over a long period of time i.e Climate Change.
  3. 12. Structures that have look similar but may have different structures, must derive from a common ancestor.
  4. 13. Gradual evolution that happens over long periods of time.
  5. 14. A change in the DNA structure of an organism.
  6. 15. The study of embryo's, or an animal in the early stages of developement.
  7. 17. Structures in an organism, population, or species that has no use to the organism and is an indicator of a common ancestor.
  8. 18. A group of animals in the same area and at the same time period that can mate with each other and produce fertile offspring.
  9. 19. A group of animals that can breed with each other and produce fertile offspring.
  10. 21. When species that have the same common ancestor evolve to have different traits resulting in two new species.
  11. 23. A key mechanism of evolution that occurs when certain traits make an organism more likely to suvive and produce offspring.
  12. 24. The study of prehistoric life.
  13. 25. The process by which a species changes over time.
  14. 26. The study of the distribution and envrionment of species.
Down
  1. 1. The process by which distantly related organisms develope similar traits due to their environment.
  2. 2. Extinction due to a catastrophic event that destroys the entire species.
  3. 3. A fundemental mechanism in evolution that states all organisms came form the same common ancestor but overtime descended and evolved to become different species.
  4. 4. A trait developed to help an organism that helps it survive longer, and reproduce more.
  5. 5. The process by which a new species arises from an old one through reproductive isolation.
  6. 6. The study of chemical processes and substances that occur within organisms.
  7. 8. The petrified remains of an animal.
  8. 10. Structures in different species that have similar functions but different origins and structures.
  9. 11. The study of the structure of body parts in an animal.
  10. 13. Pool All the genes in a population.
  11. 16. Evolution that occurs in short bursts.
  12. 20. When a female chooses to mate with a male based on favorable traits developed through evolution.
  13. 22. The transfer of genes to different population through things like migration.