I was gonna make an ecology joke

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Across
  1. 4. eats both plants and animals
  2. 6. number of living things in a single area
  3. 8. the organisms that shape the environment
  4. 10. relations of organisms with one another and their surroundings
  5. 11. when one organism benefits by harming the other
  6. 17. eats animals
  7. 18. environments and organisms working together as one
  8. 20. eats other plants or animals for energy/nutrients
  9. 21. all food chains in an ecosystem
  10. 23. can produce food using chemicals
  11. 24. organism that feeds on decaying biomass
  12. 25. a population of two or more different species in one area
Down
  1. 1. organism that cannot produce its own food
  2. 2. organisms that are hunted and killed by other organisms
  3. 3. a larger organism that homes a smaller one
  4. 5. region of earth that holds all living organisms
  5. 7. position of an organism on the food chain
  6. 9. organisms that make their own food
  7. 12. factors non-living part that shapes the environment
  8. 13. natural environment of an organism
  9. 14. organism that feeds and breaks down dead organisms
  10. 15. eats plants
  11. 16. A sequence in which the animals eat each other
  12. 19. organism that hunts and kills other organisms
  13. 22. a living thing that has the characteristics of life