Natural Selection Crossword Puzzle!

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Across
  1. 3. the process through which populations of living organisms adapt and change.
  2. 5. a group of animals or plants that are similar and can produce young animals or plants
  3. 8. an early proponent of the idea that biological evolution occurred and proceeded in accordance with natural laws.
  4. 9. receive (money, property, or a title) as an heir at the death of the previous holder.
  5. 11. a change or difference in condition, amount, or level, typically with certain limits.
  6. 12. The theory of evolution is based on the idea that all species? are related and gradually change over time.
Down
  1. 1. the action or process of mutating.
  2. 2. develop gradually, especially from a simple to a more complex form.
  3. 4. a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
  4. 6. to hide or disguise yourself.
  5. 7. the action or process of adapting or being adapted.
  6. 10. English naturalist whose scientific theory of evolution by natural selection became the foundation of modern evolutionary studies.