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The massive dividing line between a zygote and sperm/eggs is genetic uniqueness. A sperm/egg is incomplete, whereas the zygote itself is a totally separate entity from the mother. It depends on the mothers body for nutrients during development but that by itself isn't a good measure of human vs. inhuman. I'm sure no one here would consider someone who's body has degenerated under the effects of cancer or through some other process to be less human because they require machines to supply them with oxygen, blood pressure, nutrients and kidney function just like a fetus does. I'm trying to isolate the exact criteria that give something human rights, such as 'ability to function independently'. Cortical activity is another possible point, after all it is how we determine death but it doesn't address the issue of getting around laws designed to protect people by saying a zygote isn't covered under the laws.
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The most valuable renewable resource is stupidity.
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