Evolution and Natural selection

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Across
  1. 1. mountains, volcano eruptions, and large bodies of water are examples of ____ barriers that can isolate populations
  2. 4. the study of the early development of feruses of different organisms
  3. 9. giant tortoises are only found on the galapagos island, each had a different species of tortoises, this would suggest that all tortoises evolved from
  4. 11. a helpful mutation will the fitness if an individual in its environment
  5. 12. having a lot of different species living in a habitat is called
  6. 15. struggle for survival when a growing population causes a scarcity of resources
  7. 20. the process in which changes in an environment pressure a species to change
  8. 21. the source of variation in a species is _____ in DNA
  9. 22. structures that have reduced in size because they no longer serve an important function
Down
  1. 2. the whales flipper and arms of a human are examples of _____ because they gave the same borns but use them for different functions
  2. 3. fossils in the lowest sedimentary rocks layers are ____ than fossils found in higher layers of rock
  3. 5. inherited characteristics that increase chances of survival
  4. 6. all vertebrate embryos are ___ in that they all have similar patterns of development
  5. 7. ability to survive and reproduce in a specific environment
  6. 8. changes in the DNA of individuals of a population
  7. 10. the natural selection could not occur without ____ and acts on a _____
  8. 13. the ____ evolves
  9. 14. the hip bones in whales and snakes serve no function, so they are examples of
  10. 16. similarities and differences in amino acid sequences between organisms
  11. 17. a species is a group that have unique features and cannot
  12. 18. remains of dead organisms
  13. 19. the process in which traits caused by mutations slowly accumulate in a population