Animal Structure and Function

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Across
  1. 3. Rigid tube that carries air to lungs
  2. 5. Blood vessels that usually carry oxygenated blood
  3. 7. Part of digestive system with transverse, ascending, and descending parts
Down
  1. 1. Where blood exits the heart
  2. 2. System that intakes air
  3. 4. Type of blood cell that fights infections
  4. 6. Number of lobes in a human liver