Why are molecular movements needed for life?

The living organisms are well-organised structures; they can have tissues, tissues have cells, cells have smaller components in them, and so on. Because of the effects of the environment, this organised, ordered nature of living structures is very likely to keep breaking down over time. If order breaks down, the organism will no longer be alive. So living creatures must keep repairing and maintaining their structures. Since all these structures are made up of molecules, they must move

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Which is more harmful—urea or ammonia?

Ammonia 
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Which contains less nitrogenous waste, the renal vein or the renal artery?

Renal vein 
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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.

Dialysis.
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