Crossword puzzel for school

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Across
  1. 3. An ecosystem within Jamacia that is on the shoreside.
  2. 5. Aquatic environment that makes up more than 70% of the world.
  3. 7. The things in an environment, who is living there.
  4. 8. Process of removing too many fish from the sea.
Down
  1. 1. The animal with an external calcium skeleton.
  2. 2. The surroundings that something or someone is living in.
  3. 4. Substance that is harmful to the environment.
  4. 6. The thing you do with plastic bottles you find.