alt=A 17th century painting of various objects, the most prominent of which is a human skull.|thumb|The human skull is used universally as a symbol of death.thumb|alt=Three objects on a slab |A flower, a skull, and an hourglass symbolize life, death, and time in this 17th-century Vanitas painting by [[Philippe de Champaigne.]]
Death is the permanent end of biological functions that sustain a living organism, symbolized across cultures by objects like the skull. It matters because understanding death relates to fundamental human concerns about mortality, time, and the meaning of life, as reflected in historical art and cultural symbolism.
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alt=A 17th century painting of various objects, the most prominent of which is a human skull.|thumb|The human skull is used universally as a symbol of death.thumb|alt=Three objects on a slab |A flower, a skull, and an hourglass symbolize life, death, and time in this 17th-century Vanitas painting by [[Philippe de Champaigne.]]
Death is the end of life. It is the irreversible cessation of biological functions that sustain a living organism; however, the identification of the moment of death presents certain difficulties. Some organisms, such as the immortal jellyfish, are biologically immortal, they can however still die from means other than the effects of aging.
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