Immune System

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Across
  1. 2. Where blood cells are made
  2. 3. Your body's first protective barrier
  3. 7. Helps fight germs
  4. 8. A tiny germ that can cause illness
Down
  1. 1. A tiny protein that fights germs
  2. 4. Tiny building blocks of the body
  3. 5. Tiny things that can make you ill
  4. 6. Carries immune cells around the body