evolution and natural selection

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Across
  1. 4. what all cells are made up of
  2. 5. integrated group of similar cells that work together
  3. 7. an individual living being
  4. 8. what all living organisms consist of
  5. 10. ecosystem that consist of all interacting populations
  6. 11. the core theme of biology
Down
  1. 1. consists of all life on Earth
  2. 2. traits that increase individual fitness in an environment
  3. 3. changes in an organism's DNA
  4. 6. Darwin observed that no individuals are alike
  5. 9. Individuals don't ___