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You know some times there are two people/human beings created from one set of DNA - Identical Twins - Facts About Identical Twins - Frequently Asked Questions About Identical Twins , and sometimes one person/human being is created from two sets of DNA - Chimera (genetics) - Wikipedia, the free encyclopedia. Identical twins are not one in the same person/human being, Chimeras are not two people/human beings in one body. Knowing this, how can you not see the difference between human life (DNA) and person/human being?
One of the opinions of when a human life begins is that it happens after the zygote can no longer split into two individuals, as you describe above.
Another is that it happens when the heart starts to beat.
Another is that it is when there begin to be detectable brain waves.
Another is that it is at the moment of birth.
Still another is that it is at the moment of conception. This is the only opinion so strongly held that the opinionaters claim that science has determined beyond question that their opinion is the correct one.
In my opinion, it is when the brain waves start.
After all, life ends when there are is no longer any brain activity, so it seems logical that it starts when brain activity begins.
But, that's still just an opinion.