Grade 7

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Across
  1. 2. What is the smallest unit of matter?
  2. 4. What is the primary cause of immunodeficiency?
  3. 7. What is the first line of defense?
  4. 8. What is the primary immune organ?
  5. 9. What is the center of an atom called?
  6. 10. Which nutrient supports immune function?
Down
  1. 1. Which technique involves sealing food in airtight containers?
  2. 3. What type of electron transition releases energy?
  3. 5. What protects the body against infections?
  4. 6. Which organ filters pathogens from blood?