https://www.youtube.com/watch?v=JQoSZixSFEw
https://www.youtube.com/watch?v=qn_7X9t3xTs
NOTE: If you have a hard time understanding the concepts of continuity of life/evolution, and change as the potential person develops, think in terms of emergence: for example, oxygen and hydrogen are not water until they merge to form it. Thus, parents - sperm and egg - zygote - embryo - fetus - viable person.
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