That is two questions. The law (in the US) sets personhood at birth or when the baby is removed from the womb. The law does not establish when that person attained life. Science is a bit vague too. The most recent definition is “Life is an organized matter that provides genetic information metabolism.” In turn, the term “genetic information metabolism” means comprising functioning, reproduction, and creation of genes and their distribution among living and non-living carriers of genetic information. Under that definition, human life begins at the moment, the cells contained in the ovum and sperm begin to metabolize and follow the genetic plan that exists within them.

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