Nutrition in animals

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Across
  1. 2. Excretion tubes in worms
  2. 4. The system that is made up of tubes or vessels
  3. 5. Tubes that links the animals tissue to the outside
  4. 7. the type of cells animals have
  5. 8. Fish use these to breathe
Down
  1. 1. Do not have an internal skeleton
  2. 3. Tubules that vertebrates use
  3. 6. Waste elimination