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The definition of life has long been a challenge for scientists and philosophers. [ 2 ] [ 3 ] [ 4 ] This is partially because life is a process, not a substance. [ 5 ] [ 6 ] [ 7 ] This is complicated by a lack of knowledge of the characteristics of living entities, if any, that may have developed outside Earth.
People determine human purpose without supernatural influence; it is the human personality (general sense) that is the purpose of a human being's life which humanism seeks to develop and fulfill: [97] "Humanism affirms our ability and responsibility to lead ethical lives of personal fulfillment that aspire to the greater good of humanity". [99]
Genes and the environment influence human biological variation in visible characteristics, physiology, disease susceptibility, mental abilities, body size, and life span. Though humans vary in many traits, humans are among the least genetically diverse species.
The human condition can be defined as the characteristics and key events of human life, including birth, learning, emotion, aspiration, reason, morality, conflict, and death. This is a very broad topic that has been and continues to be pondered and analyzed from many perspectives, including those of art , biology , literature , philosophy ...
Human rights, principles or norms that describe certain standards of human behaviour and are regularly protected by law; Beginning of human personhood, the moment when a human is first recognized as a person; Biography, a detailed description or account of a person's life; Autobiography, a self-written account of the life of oneself
Scientists have debated the definition of life for decades, but they still lack a consensus on the answer.
Many of those discussions will hinge on the question of when, exactly, is the beginning of a human life that could – or should – be protected by law. A frien.
Fertilization is the fusing of the gametes; a sperm cell and an ovum (egg cell) fuse to form a single-cell zygote.This is the beginning of the diploid phase of the human life cycle after two genetically unique haploid cells created via meiosis and chromosomal translocation combine their DNA and begin to develop into a multi-cellular organism.