I'm assuming they made sure the stories were deemed super important to all of the younger generations so it passed down better. There were many human civilizations that passed down stories and customs through oral storytelling only.
Well, do you think humans started out with 100 people to select from? No. We had to breed with close relations at some point and eventually it will have become such a distant blood connection that it would no longer be considered one. Eventually the similar Dna and blood type would have been gravely different.
id assume their lifespans werent very long and they fucked like rabbits so the population would stay about the(because they kept dying) while the gene pool increased (due to random mutations)over time meaning they would have been genetically diverse enough to survive also there should have been enough mutation to them to where they would be very well adapted to living there
I was curious and decided to look into this. It is thought that a minimum of 50 is needed in a population to combat inbreeding, and 500 to reduce genetic drift. A starting population of 4 (not including the people that didn't add to the gene-pool) is just not realistic. Sometimes you just have to accept that it won't be 100% realistic, if it was then half the things Senku has done wouldn't have been possible. It's still a great show.
Not gonna lie, i called that s**t at episode 6. Senkus dad founded the village. I litteraly turned to my cousin and said. "You know what?"
"What?" He quizickly taunted...
"Senkus dad definitely founded that village."
"How do you know that?" He asked
"Call it a hunch." i said
So they landed on an island near South America, made the village there and then magically it became part of japan even though it was too far to reach by boat before?
How else did senku walk to the village?
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