Nitrogen - gaseous element that makes up 78% of the atmosphere., Nitrates - Plants use these compounds to help make amino acids., Bacteria - microscopic organisms that transform nitrogen into forms that plants can use., Decomposers - Bacteria and fungi are classified as ......................, Energy  - It cannot be created or destroyed and passes THROUGH ecosystems., Matter - is continually recycled within ecosystems., Photosynthesis and respiration - play important roles in cycling carbon, hydrogen and oxygen within ecosystems., Mutualism - a relationship in which both organisms benefit. , Atmospheric nitrogen - nitrogen that is found in the atmosphere., Carbon - this element is found in all living creatures.,

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