Evolutionary Relationships

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Across
  1. 9. The branch of biology that studies the internal and external physical structures of organisms and how those structures relate to their function and survival.
  2. 12. A fossil that shows characteristics of both ancestral species and more modern species, helping scientists understand evolutionary transitions.
  3. 13. The process in which unrelated species develop similar traits because they live in similar environments or face similar challenges.
  4. 14. The study of the size, shape, and structure of organisms and their specific body parts.
  5. 16. Body structures in different species that have similar underlying anatomy because they were inherited from a common ancestor, even if they serve different functions today.
  6. 19. Structures in different species that perform similar functions but differ in anatomy and evolutionary origin, showing that they evolved independently.
  7. 20. The process by which related species become more different over time as they adapt to different environments or lifestyles.
Down
  1. 1. Differences in inherited traits within populations that occur over many generations.
  2. 2. A recognizable trend in how traits or species change over long periods of time.
  3. 3. A physical or behavioral trait that increases an organism’s chances of surviving and reproducing in a specific environment, often developing over many generations
  4. 4. A group of organisms that share similar characteristics and can reproduce with one another to produce fertile offspring under natural conditions.
  5. 5. The process by which populations of organisms change over many generations as traits become more or less common, often due to environmental pressures and inheritance.
  6. 6. A past organism from which two or more different species evolved, explaining similarities in their structures or traits.
  7. 7. Reduced or unused body parts that were functional in ancestors but have little or no function in modern organisms, providing evidence of evolutionary change.
  8. 8. The evolutionary history of a species or group of species, showing how they are related through descent from common ancestors.
  9. 10. The scientific system used to name, describe, and classify organisms in an organized and standardized way.
  10. 11. The likeness in physical features between organisms that may indicate shared ancestry or evolutionary relationships.
  11. 15. Preserved remains, impressions, or traces of organisms from the past that help scientists study ancient life forms and evolutionary history.
  12. 17. The complete collection of fossils discovered on Earth, arranged by age, which shows how life has changed and diversified over time.
  13. 18. Refers to species that are currently living and can be observed in the present day.