Unit 6 Biology

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Across
  1. 4. Shows unrelated organisms come to resemble one another.
  2. 6. Form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water.
  3. 8. A hypothesis that has been tested with a significant amount of data.
  4. 10. A single species or a small group of species evolve.
  5. 16. Principle that all living things were derived from common ancestors.
  6. 20. Inherited characteristic that increases an organism's chance of survival.
  7. 21. Form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding.
  8. 22. Separation of species or populations so that they cannot interbreed and produce fertile offspring.
  9. 23. Change over time.
Down
  1. 1. Form of reproductive isolation in which two populations reproduce at different times.
  2. 2. A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together.
  3. 3. Structures in different species that are similar because of common ancestry.
  4. 5. Natural Selection is the driving force of evolution and refers to the differential survival and reproduction of individuals due to differences in phenotype and general fitness.
  5. 7. Remains or traces of life that have been preserved in sedimentary rock over time.
  6. 9. When there are not enough resources for organisms to thrive so there is a constant struggle.
  7. 11. When an organism die out.
  8. 12. Diagram that shows relationships between species or relationships are based on derived characteristics.
  9. 13. The inner germ layer that develops into the lining of the digestive and respiratory systems.
  10. 14. Model that uses DNA comparisons to estimate the length of time that two species have been evolving independently.
  11. 15. The formation of new and distinct species in the course of evolution.
  12. 17. Structure that is inherited from ancestors but has lost much or all of its original function.
  13. 18. Middle germ layer; develops into muscles, and much of the circulatory, reproductive, and excretory systems.
  14. 19. Two species evolve in response to changes in each other over time.