25 vocab .

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Across
  1. 2. decomposition.
  2. 4. in the environment , involving the incorporation of carbon
  3. 7. respirtion , the decay of dead organisms , and the burning of fossil fuels
  4. 8. Web / a system of interlocking and Interdepent food chains
Down
  1. 1. cycle / the series of processes by which carbon compounds are
  2. 3. cycle / the series of processes by which nitrogen and its compounds are
  3. 5. / the draining away of water.
  4. 6. into living tissue by photosynthesis and its return to the atmosphere