What criteria do we use to decide whether something is alive?
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Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not.
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The most important criteria to decide that something is alive is the movement. All living things move by themselves without any external help. In some cases the movements of living things are quite fast which can be easily observed but in other cases the movements are very slow and hence observed with difficulty.
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