Natural selection

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Across
  1. 1. The natural process by which something takes place.
  2. 5. What happens when there is too many offspring?
  3. 6. What was Darwin called?
  4. 8. When a change in this happens the organism may die.
Down
  1. 2. What did Darwin perform to answer a question?was Darwin called?
  2. 3. What is the struggle among living things called?
  3. 4. Individuals with this survive and reproduce.
  4. 7. What happens when there is less oxygen in water?