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• Answer Key: Immune System (Grades 3 to 5) for Educators

  
  

  This answer key is part of the Teacher's Guide on Immune System for grades 3 to 5.

• Teacher's Guide: Mouth and Teeth (Grades 9 to 12) for Educators

  
  

  These activities will help your students understand why it’s so important to adopt and maintain healthy oral hygiene habits.