L3 BO VOC

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Across
  1. 1. Underwater ridges, often made of coral (5 letters).
  2. 5. Harmful species introduced to new areas (8 letters).
  3. 7. One who works to preserve nature (15 letters).
  4. 9. Legally safeguarded, as species or areas (9 letters).
  5. 10. Green or brown marine plants, some microscopic (5 letters).
  6. 11. Ocean floor, home to benthic creatures (6 letters).
Down
  1. 2. At high risk of extinction (10 letters).
  2. 3. Meets needs without harming the future (11 letters).
  3. 4. Natural environment of an organism (7 letters).
  4. 6. Center of a cell, where DNA resides (7 letters).
  5. 8. Gone forever, like dinosaurs (7 letters).