The quest for a neurological marker of the beginning of human personhood owes its impetus to the perceived symmetry between processes at the beginning and end of life thus if brain function is a criterion used to determine the medical death of a person it should also be the criterion for its beginning. Life is a process that has a beginning and an end the consensus about the time when human life really begins is still not reached among scientists philosophers ethicists sociologists and theologizes the scientific data suggested that a single developmental moment marking the beginning of human life does not exist. the zygote formed by the union of an oocyte and a sperm is the beginning of a new human being keith l moore before we are born essentials of embryology 7th edition philadelphia pa saunders 2008 p 2 although life is a continuou. The beginning of human life is seen differently by different individuals groups cultures and religions embryonic and fetal life are a continuum within which are time sequences and points birth of a newborn viability neuromaturation implantation and conception that may be declared as the . Life on earth began more than 3 billion years ago evolving from the most basic of microbes into a dazzling array of complexity over time but how did the first organisms on the only known home to
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