Natural Selection

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Across
  1. 2. How something is built or put together.
  2. 6. Availability limits the size of a population.
  3. 7. A trait helps organisms to survive and reproduce.
  4. 9. Differences of members of a species genes.
Down
  1. 1. Organisms do well they pass they pass on genes.
  2. 3. How an organism's body systems functions
  3. 4. The process of populations changing over time.
  4. 5. A different form or version of something.
  5. 8. The way an organism acts to a stimulus.