Extinct animals

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Across
  1. 3. green mushy plant in the sea
  2. 7. sea animal that crawls on it's belly
  3. 8. slightly overweight
  4. 9. finding something for the first time
  5. 10. sheep and other animals kept for eating
Down
  1. 1. something you can’t explain
  2. 2. not being able to fly
  3. 4. when the water rises in the ocean
  4. 5. something you get for completing something
  5. 6. when an animal dies and there are no more