Question

using visible movements as the defining characteristics of life is not enough. why ​

Answer 1

Involuntary movements in animals and growth related movements in plants may not be visible. But still the indicator life. molecular movementsare also visible, which still keep the bodies alive. So, using visible movement as the defining characteristics of life is not enough.

Answer 2

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Using visible movement as the defining characteristic of life is not enough because movements over very small scales will be invisible to the naked eye like movements of molecules.

Hope it helps !