Scientific
Few would argue that if we found a cluster of cells on another planet, we would have found life. However, for some reason, the conversation on earth is quite different. For whatever reason, science has been ignored in the conversation regarding human embryos. The fact is life begins when a sperm fertilizes an egg. Period. The embryonic development of a human is complex. We found a good explanation for those interested in learning more.
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Embryo and Embryonic Development
When Does Human Life Begin? A Scientific Perspective
When Does Human Life Begin? The Scientific Evidence and Terminology Revisited