Biology

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Across
  1. 4. They are heterotrophs but feed on dead things.
  2. 7. nitrogen makes this as a fixed molecule
  3. 8. They are heterotrophs. they feed on other organisms
  4. 10. When plants and animals decompose and decomposers return ammonia to soil
Down
  1. 1. Variety of all types of organisms living in a given area
  2. 2. one organism benefits and other organism is harmed
  3. 3. An organism that is an autotroph. which means it can make its own food.
  4. 5. One benefits and the other isn't harmed or benefited
  5. 6. In 78% of the atmosphere
  6. 9. In all macromolecules