natural selection

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Across
  1. 1. Is a group of organisms that can reproduce with another nature.
  2. 4. Is any difference between cells organisms and groups.
  3. 5. Is the biological mechanism by which organisms adjust to new environments.
  4. 6. Is a reproductive success and reflects how well an organism is adapted.
Down
  1. 2. Is the complete disappearance of a species.
  2. 3. Is a mechanism of evolution