Life Processes
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Why there is a controversy about whether virus are truely alive or not?

Viruses do not show any visible or molecular movement in them until they infect some cell. So, there is controversy whether they are alive or not.
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    Name the artificial method for the removal of liquid nitrogenous waste from the body.
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    Which contains less nitrogenous waste, the renal vein or the renal artery?
    Answer
    Why are molecular movements needed for life?
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    Which is more harmful—urea or ammonia?
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