Crossword

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Across
  1. 3. Explosion- rapid increase in population
  2. 8. mating and rearing of young
  3. 10. a plant eater
  4. 14. used by plants
  5. 15. number of species in an area at any given time
  6. 18. block out much of the sun's ultraviolet radiation
  7. 20. all organisms in a particular area at a given time
  8. 21. where an organism lives
  9. 22. dry weight of organisms in a trophic level
  10. 23. bacteria and fungi break down dead organisms
  11. 25. a green plant which produces its own food with photosynthesis
Down
  1. 1. function more effectively to survive in its surroundings
  2. 2. collective interaction of all biomes on Earth
  3. 4. evaporation, condensation, precipitation and transpiration
  4. 5. each level of the food chain
  5. 6. sulphuric acid and nitric acid
  6. 7. obtains nutrients from detritus
  7. 9. compete for the same resource
  8. 11. relationship of two different species with live together for a time
  9. 12. one organism helps another organism
  10. 13. chain- series of organisms showing feeding relationships
  11. 16. eats plants and animals
  12. 17. network of interrelated food chains
  13. 19. interrelationships of living organisms in their environment
  14. 24. eats dead animals