Evolution and Natural Selection

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Across
  1. 4. asexual reproduction by a separation of the body into two new bodies
  2. 5. choosing parents with particular characteristics to breed together and produce offspring
  3. 6. branch of science that is related to the formation, growth, and development of embryo
  4. 7. structural modification made to a part of the body
  5. 8. mechanisms of gene transfer from one population to another
  6. 10. An organism can change to adjust to its immediate habitat/environment
  7. 11. microscopic, single-celled organisms that exist inside and outside other organisms
  8. 15. very simple microorganisms that infect cells and may cause disease
  9. 17. reproduction of viruses using a host cell to manufacture more viruses
  10. 18. the fusion of male and female gametes to create organisms
  11. 19. provides a record of how creatures evolved
  12. 20. Different organisms vary in how they look and function
Down
  1. 1. the process through which populations of living organisms adapt/change
  2. 2. method by which a virus can replicate its DNA using a host cell
  3. 3. something an animal does usually in response to some type of external stimulus to survive
  4. 9. organisms whose cells contain a nucleus and other membrane-bound organelles
  5. 12. one parent copies itself to form a genetically identical offspring
  6. 13. individuals compete for access to mates and fertilization opportunities
  7. 14. any organism that lacks a nucleus and other organelles due to the absence of internal membranes
  8. 16. the complete disappearance of a species from Earth