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Type: Multiple-Choice
Category: Circulatory and Immune Systems
Level: Grade 7
Author: llxd173001
Last Modified: 10 days ago

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Circulatory and Immune Systems Question

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Grade 7 Circulatory and Immune Systems

Which cells fight off infection?
  1. red blood cells
  2. white blood cells
  3. bone cells
  4. nerve cells
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