Ecology group 2 Crossword puzzle

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Across
  1. 2. pyramid that shows the biomass at each trophic level is called a _____ pyramid
  2. 5. where do producers get their energy
  3. 6. predators what is a the top of a food chain or food web
  4. 9. nitrogen enters the ecosystem via one of two ways
  5. 10. Group of the same species in the same area
  6. 11. how many levels of organization are there
  7. 12. what is the most specific level of organization
  8. 13. nitrogen is taken into the roots of plants
  9. 15. this bacteria forms mutualistic type of relationship with plants by infecting their roots
  10. 16. what does the arrows represent in a food chain or web
  11. 17. how much of the earth atmosphere is comprised of nitrogen
  12. 18. where only one organism benefits but the other is not harmed
Down
  1. 1. what eats other things
  2. 3. pyramid that shows the number of individual organisms in each trophic level is called a pyramid of ______
  3. 4. is an element, a building block of matter
  4. 7. where both organsims benefit from each other
  5. 8. adds carbon to the soil
  6. 13. what is at the Begining of a food chain or web
  7. 14. converts CO2 _ C6H12O6
  8. 17. pyramid that shows the 10% energy transfer between trophic levels is called a ______ pyramid