Evolution

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Across
  1. 4. : A change in the DNA sequence that makes up a gene.
  2. 5. : The collection of all known fossils and their placement in the sequence of rock formations and geological time.
  3. 6. : The process of gradual change in a species over generations.
  4. 9. : Organs or structures that have no apparent function but resemble functioning organs in related organisms.
  5. 10. : Differences in traits among individuals in a population, resulting from genetic differences.
Down
  1. 1. : The complete disappearance of a species from Earth.
  2. 2. : The process by which organisms better adapted to their environment tend to survive and produce more offspring.
  3. 3. : Structures in different species that are similar because of common ancestry.
  4. 7. : The formation of new and distinct species in the course of evolution.
  5. 8. : The process by which a species becomes better suited to its environment.