The Death reference article from the Simple Wikipedia on 24-Jul-2004
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Death

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Death is a term that is used to describe the permanent ending of life processes in a plant or animal life form. It can have several causes:

These, among others, are ways in which life forms die. Life forms which have died are normally described as being dead.

Human death is very carefully tracked in case of a killing or something (like a disease) that may continue to kill other humans. Also there are rituals like a funeral around human death, that are usually required by religion or state.