A fishy story and Flora and Fauna of ocean

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Across
  1. 3. its scientific name is hippocampus
  2. 4. a pupil who stays away from school
  3. 5. the writer and his friend came for
  4. 6. biggest animal in the ocean and the planet
  5. 8. also called as seals
Down
  1. 1. Requires carbon dioxide to survive
  2. 2. the writers friend
  3. 3. Good nursery habitats for fish
  4. 4. a chiefly freshwater fish of the salmon family
  5. 7. a man who rents out land. he is mentioned in the story