What do ancient megalithic structures have to do with this conversation bud? You are having another meltdown because you cannot accept that Noah's ark story doesn't make sense.
Here is something to consider how would 8 individuals and only 2 of each animal not cause catastrophic inbreeding? Think about it take all the time you need.
megalithic stone structures
found all over the world. obviously from an ancient forgotten people. matches the biblical narrative
its relevant because it crushes the 'atheist imaginary "we wuz monkeys n stuff" narrative
'inbreeding is caused by expressing genetic mutations (copying errors). God brought the animals for noahs arc. he would simply bring animals with out the genetic errors. (genetic errors could have also been repaired)
the best part about genetic errors is the 'atheist uses the idea as the grand building up process for 'evolution. lol but then its bad when its needed to be bad.