B18

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Across
  1. 2. Feeding position in a food chain
  2. 4. Path of energy transfer
  3. 6. Reproductive success in evolution
  4. 8. Protection of natural resources
  5. 10. Total mass of living matter
  6. 13. Organism breaking down dead matter
  7. 15. Responsible use of resources
Down
  1. 1. Variety of life in an area
  2. 3. Permanent disappearance of a species
  3. 5. Process favoring advantageous traits
  4. 7. Preserved remains of ancient life
  5. 9. Interconnected food chains
  6. 11. Organism making its own food
  7. 12. Continued existence of an organism
  8. 14. Organism obtaining energy from others