What would happen if all animals on Earth were herbivores?

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Across
  1. 4. animals that eat meat mostly
  2. 5. the environment where animals live
  3. 8. to be placed within a group of similiar items or things
  4. 9. things added to something else to complete or enhance it
  5. 11. to fall down
  6. 12. a colourless and odourless gas which is the main part of natural gas (CH4)
  7. 14. the sides of a river
  8. 16. adds to or becomes a part of
Down
  1. 1. animals that are near extinction
  2. 2. organisms that produce spores (e.g. mould, yeast, mushrooms)
  3. 3. animals (and plants) that live in nature
  4. 6. animals that eat carrion (dead animals)
  5. 7. animals that eat plants
  6. 10. full of mud
  7. 13. a simple aquatic plant (e.g. seaweed)
  8. 15. an area where animals eat and use the animals and plants