Cycling of Matter in an Ecosystem

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Across
  1. 3. Nutrient source for plants
  2. 4. Organisms use energy for ______
  3. 5. Organisms that make their own energy
  4. 8. Organisms that help matter return to the environment
  5. 10. Organisms that must eat other organisms for energy
  6. 11. Makes up everything
Down
  1. 1. Very small organisms invisible to the eye
  2. 2. An organism's surroundings
  3. 6. Process plants use to make energy
  4. 7. Organisms and their physical environment
  5. 9. Energy source for plants