Why is the lionfish left alone?

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Across
  1. 2. Small parts inside the body that make and release things like sweat, hormones, or poison .
  2. 4. Something that is different or unusual.
  3. 7. A harmful substance that can make you sick or hurt you.
  4. 9. When something is bothered or not calm anymore.
Down
  1. 1. To make someone unable to move their body.
  2. 3. a synonym means to shake, usual from feeling cold
  3. 5. A body part that helps you move by tightening and relaxing.
  4. 6. full of color
  5. 8. Sharp, pointy parts on some animals or plants that can protect them.