| http://www.w3.org/ns/prov#value | - It is a challenge for scientists and philosophers to define life in unequivocal terms.[19][20][21] This is difficult partly because life is a process, not a pure substance.[22] [23] Any definition must be sufficiently broad to encompass all life with which we are familiar, and must be sufficiently general to include life that may be fundamentally different from life on Earth. [24] [25] [26]
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