Natural selection

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