Unit 3 Biology

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Across
  1. 3. example of an abiotic factor
  2. 6. stage 2 of speciation
  3. 7. stage 1 of speciation
  4. 9. the process of which green plants make their own energy
  5. 10. the number of organisms of the same species in a habitat
  6. 13. made up of many food chains
  7. 14. scientists do this which allows crops to grow bigger and stronger
  8. 16. this uses nitrates and phosphates to grow out on control
  9. 17. this is need by crops to form amino acids
  10. 18. this is not a limiting factor
  11. 19. example of selective pressures
  12. 20. caused by errors in genetic material
Down
  1. 1. something in short supply that prevents photosynthesis from taking place at maximum rate
  2. 2. where an organism lives
  3. 4. living things
  4. 5. this type of farming usually involves one crop
  5. 8. the ultimate source of energy
  6. 10. carnivore that hunts prey species
  7. 11. role an organism plays
  8. 12. the organisms which occupy a habitat
  9. 15. energy lost from a food chain
  10. 19. usually a green plant which photosynthesises
  11. 21. show the direction of energy flow