Scientifically speaking, when does every new human life begin?
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Per the "American Heritage Dictionary of Science," there are four empirical attributes of life: growth, reproduction, response to stimuli, and metabolism. Numerous scientific texts document that these attributes are all present at fertilization, which is the earliest stage of human development. In keeping with these facts, the medical textbook "The Developing Human: Clinically Oriented Embryology" states that fertilization marks the "beginning of a new human being."
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