under the sea (easy)

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Across
  1. 3. Similar to octopus but with longer body
  2. 6. Apex ocean predator
  3. 7. Intelligent marine mammal
  4. 8. Hard-shelled marine reptile
  5. 10. Flower-like sea animal
  6. 12. Largest mammal in the sea
  7. 13. Eight-armed sea creature
  8. 14. Rise and fall of sea level
  9. 15. Sideways walking crustacean
Down
  1. 1. Five-armed echinoderm
  2. 2. Gentle sea mammal similar to manatee
  3. 4. Gelatinous floating creature
  4. 5. Colorful underwater structure
  5. 6. Plant-like ocean vegetation
  6. 9. Small upright swimming creature
  7. 11. Large clawed crustacean