👉 Blood cells are tiny red spheres packed with oxygen; they rapidly circulate through veins, delivering vital nutrients to body tissues. When in distress, white blood cells swarm, attacking invaders and restoring health.
👉 Blood cells are tiny red spheres packed with oxygen; they rapidly circulate through veins, delivering vital nutrients to body tissues. When in distress, white blood cells swarm, attacking invaders and restoring health.
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