Natural selection

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Across
  1. 3. A group of similar organisms that can breed and produce fertile offspring
  2. 5. The struggle between organisms to survive in a habitat with limited resources
  3. 6. A random error or change in a DNA sequence that affects genetic information
  4. 7. A trace of an ancient organism that has been preserved in rock
  5. 8. Differences in physical traits of an individual from the species to which it belongs
  6. 9. English naturalist who formulated a theory of evolution by natural selection (1809-1882)
Down
  1. 1. A term that typically describes a species that no longer has any known living individuals
  2. 2. An inherited trait/traits that helps an organism survive and reproduce
  3. 4. The gradual change in a species over time