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Scientifically speaking, when does human life begin?

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There are four empirical attributes of life: growth, reproduction, response to stimuli, and metabolism. All of these are present at fertilization. Likewise, the genetic composition of humans is formed during fertilization, and these genes are "the very basis of life itself." In accord with these facts, the textbook "Before We Are Born: Essentials of Embryology and Birth Defects" states: "The zygote and early embryo are living human organisms."

DocumentationWhen does life begin?

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