Observable movement, growth, reproduction, and responsiveness to stimuli are commonly considered indicators of life.
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Common indicators of life include cellular organization, metabolic activity, growth, response to stimuli, reproduction, and adaptation. Living organisms exhibit complex, organized structures at the cellular level. Metabolism involves the processing of energy and nutrients for sustenance. Growth refers to an increase in size or number of cells. Responsiveness to environmental stimuli showcases an organism’s ability to interact with its surroundings. Reproduction ensures the continuity of the species, and adaptation reflects the capacity to evolve and survive in changing conditions. These indicators collectively distinguish living entities from non-living matter, forming the basis for the definition and recognition of life.