Natural Selection

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Across
  1. 3. a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained
  2. 7. receive (money, property, or a title) as an heir at the death of the previous holder.
  3. 9. he process whereby organisms better adapted to their environment
  4. 10. a change or difference in condition, amount, or level, typically with certain limits.
  5. 11. the disguising of military personnel, equipment, and installations by painting or covering them to make them blend in with their surroundings.
  6. 12. a biologist knowledgeable about natural history
Down
  1. 1. the action or process of mutating.
  2. 2. he action or process of adapting or being adapted.
  3. 4. develop gradually, especially from a simple to a more complex form
  4. 5. based on the idea that all species? are related and gradually change over time.
  5. 6. a group of living organisms
  6. 8. the principle that physical changes in organisms during their lifetime