Biology

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Across
  1. 2. Regions along coastlines where streams or rivers flow into a body of salt water
  2. 3. An underwater structure made from the outside skeleton soft-bodied animals called coral
  3. 7. The process of one ecological community gradually changing into another
  4. 8. A stable community that no longer goes through major ecological changes
Down
  1. 1. The first species that colonize new or undistributed land
  2. 2. The process of a body of water becoming nutrient-rich
  3. 4. The ocean shore between the lowest low tide and the highest high tide
  4. 5. Aquactis ecosystems that have a thin layer of water covering soil that is wet most of the time
  5. 6. The amount of salt dissolved in water