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Why is there controversy about whether viruses are truly alive?

Question
Why is there controversy about whether viruses are truly alive?
They do not reproduce
They do not show molecular movement until they infect a cell
They are too small to see
They lack a nucleus
Answer
They do not show molecular movement until they infect a cell
Detailed Explanation
Viruses do not show any molecular movement until they infect a host cell, which is part of why their status as living beings is debated.
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