Biology Part 1

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Across
  1. 3. feed on the remains of other organisms
  2. 4. random changes in genes
  3. 7. Organisms that DO NOT have a nucleus
  4. 9. membrane bound structures in a cell
  5. 10. plant eaters
  6. 12. Animals that DO NOT have a backbone
  7. 15. Organisms that use another as food
  8. 17. a trait that helps an organism survive
  9. 18. Plants take in CO2, then release oxygen
  10. 19. normal differences in a species
  11. 20. Organisms that make their own food
  12. 21. all the populations and the abiotic factors
Down
  1. 1. meat eaters
  2. 2. remains or evidence of organisms from the past
  3. 5. Animals that have a backbone
  4. 6. a system of several food chains
  5. 8. Organisms that have a nucleus
  6. 11. demonstrates the flow of energy in food chain
  7. 13. when all the organisms of a species die
  8. 14. process of organism changing over time
  9. 16. feed on both producers and other consumers