I defend against invaders, working silently within, essential to health and survival, yet often unseen. What am I?
Category: Science · Difficulty: expert
Hint: Think about the body's defense system.
Answer
White blood cells
Explanation
White blood cells are part of the immune system and help defend the body against infections and diseases.
This is a expert science riddle — one of the harder riddles here. The answer is White blood cells.
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