Theory of Evolution

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Across
  1. 1. reserved remains or traces of organisms that show the history of life on Earth.
  2. 5. Animals with a backbone; include fish, amphibians, reptiles, birds, and mammals.
  3. 6. Economist whose ideas on population growth influenced Darwin; he argued that populations tend to increase faster than resources, leading to competition.
  4. 8. Selection — The process where advantageous traits increase an organism's chances of survival and reproduction.
  5. 9. Animals without a backbone; some of the earliest life forms.
  6. 10. Similarities in early developmental stages among different species.
  7. 13. Random changes in DNA that introduce new genetic variation.
  8. 14. Similar body parts in different species indicating common ancestry.
  9. 15. The distribution of species across different geographic areas.
  10. 17. Differences in traits among individuals within a species due to genetic differences.
  11. 18. The concept that body parts used frequently become stronger, while those not used weaken over generations.
  12. 20. A trait that helps an organism survive and reproduce in its environment.
  13. 22. Naturalist who proposed the theory of natural selection, explaining how species evolve over time.
  14. 23. The idea that traits developed during an organism’s lifetime can be inherited by offspring.
Down
  1. 2. The idea that certain organelles (like mitochondria and chloroplasts) originated from free-living bacteria that were engulfed by early eukaryotic cells.
  2. 3. The formation of new species from existing ones over time.
  3. 4. Geologist who popularized uniformitarianism, emphasizing that Earth's features result from ongoing processes over long timescales.
  4. 7. The process by which species change over time through genetic variation and natural selection.
  5. 11. DNA similarities that support evolutionary relationships.
  6. 12. Early evolutionary thinker who proposed that organisms can pass on traits acquired during their lifetime.
  7. 16. Random changes in gene frequencies, especially in small populations.
  8. 19. The supercontinent that existed millions of years ago, supporting the idea of continental drift and evolution.
  9. 21. Geologist who proposed that the Earth is shaped by slow, natural processes over immense periods, influencing ideas about deep time.