Natural Selection

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Across
  1. 3. to gradually develop over time
  2. 7. a distinguishing feature belonging to an organism
  3. 8. he proposed the theory of evolution by natural selection
  4. 9. unit that determines a particular characteristic in an organism
  5. 10. the preserved remains or impression of a plant or animal
Down
  1. 1. a set of statements or ideas intended to explain a topic or phenomena
  2. 2. a group of organisms that belong to the same species or are living in the same area
  3. 4. the ability of an organism to alter their structure or function to better suit its environment
  4. 5. to continue to live or exist
  5. 6. a difference in individual species