Ecology Crossword

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Across
  1. 3. The highest order in levels of Ecology
  2. 4. Species that are the first into a new area
  3. 6. Plants
  4. 11. Third stage of growth where population levels off
  5. 13. Primary ______ eats only plants
Down
  1. 1. Zone that gets no sunlight
  2. 2. Density ______ includes living things
  3. 5. Carrying ______ is the ideal number of individuals in an ecosystem
  4. 7. Two species who both benefit from each other
  5. 8. Succession that starts from no soil
  6. 9. Very low rain and includes cacti
  7. 10. Study of interactions between organisms and their environment
  8. 12. Where freshwater meets salt water