I can invade a cell and multiply, yet I am not alive. What am I?
Category: Science · Difficulty: hard
Hint: I need a host to reproduce and often cause disease.
Answer
A viral particle
Explanation
Viruses are considered non-living entities that require a host cell to replicate and can cause illnesses.
This is a hard science riddle — a tricky one that takes a little thought. The answer is A viral particle.
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