To evaluate if something is alive, we have to check if the entity in question displays any of the various life processes such as – respiration, movement, growth, reproduction, nutrition and excretion.
Even plants which are immobile show other forms of movement such as vertical or lateral movement. When an organism dies, it exhibits none of the stated life processes and is technically considered “dead.” However, entities such as viruses fall on the borderline as they exhibit life processes when inside a cell. Outside the cell, however, they exhibit characteristics of non-living things.
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