Emeralds [crossword puzzle]

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Across
  1. 1. tail
  2. 2. not a fish
  3. 4. friend
  4. 6. dolphins can see
  5. 7. a baby dophin
  6. 8. keeps them warm
Down
  1. 1. part of body
  2. 3. dophins can
  3. 4. what they use to breath
  4. 5. what swim in