👉 A red blood cell, resembling a tiny, flexible ball, zips through veins, delivering oxygen to tissues. White blood cells, the body's defenders, patrols rapidly, engulfing and fighting off invaders swiftly.
👉 A red blood cell, resembling a tiny, flexible ball, zips through veins, delivering oxygen to tissues. White blood cells, the body's defenders, patrols rapidly, engulfing and fighting off invaders swiftly.
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