So far its all "well it could be this way" stretching the absolute boundaries of both magic and common sense to explain it instead of the simpler more sensible explanation.
What is common sense to one person is an absurdity to another. That is a very relative term. Secondly, I don't really feel the need to prove that the flood actually happened, only that it could have happened. How did life come about? We don't know based on any proofs or irrefutable evidence since we have been unable to replicate the process that produced the first life. That doesn't stop people from believing that life evolved from nonlife. Possibilities of how it could have happened are all we are given while being told that we must accept and believe. Why is that standard ok for the origin of life but not ok for the possibility of the flood, particularly the explanations that I have offered to this point?
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Thank you for your concise description of the genetic flaw which limits our age. I have a few questions relating to it.
What causes the difference in life-span between a dog and a tortoise, both eukaryotic organisms with dramatically different lifespans?
Secondly, you refer to "non coding DNA". I assume that this refers to DNA which isn't actually used by the organism for manufacture of anything, rather performs a role of meat shield against attacks on the vital portions of DNA, ie viral and transposon attacks usually muck up the non coding rather than coding DNA. Am I correct in my understanding of this?
Thirdly, you say that first three nucleotides cannot be replicated. Would this be a problem if there were place holding nucleotides before the first three important nucleotides?
Finally, how does the problem of being unable to reproduce those three nucleotides shorten life spans?
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Inbreeding.
Why is inbreeding lethal? It gives recessive traits a higher liklihood of expressing themselves. The longer the inbreeding continues and the more closely related the inbreeding subjects are related, the higher the liklihood that those traits will be expressed or purebred into the organism's offspring. Recessive traits can be bred out of an organism's offspring eventually producing a generation lacking the trait.
I suspect that there were far fewer dangerous recessive traits in the genetic code of every organism at the time of the flood. This would minimize the impact of inbreeding in the short term. The more corrupt the code, the more problems when it is replicated. A relatively pure code is less susceptible to the dangers of inbreeding.
Under the right conditions 2 organisms are capable of reproducing and establishing a stable population and are not guaranteed to die. You assume that today's conditions were yesterday's. This assumption is not verifiable and should not be relied on to the exclusion of other possibilities.
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Increase in lethal mutations in a genetic code.
A lethal mutation need not express in an organism; it may be recessive. The trait can be carried and passed with no benefit or detriment to the organism carrying it. When an organism does not suffer or benefit from a change to its code, evolution will not act on that change. In this way a defect can be carried and passed down from generation to generation without being noticed. Over time new mutations occur and passively wait in the genetic code for a time to express themselves. The result is an increase in the number of mutation in a code over time.
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Lions and Tigers and Jaguars oh my!
You tell me that lions and tigers are incredibly different then go on to say that they have a common ancestor. Which is it, they can or cannot come from the same thing? Then you say that while lions and tigers have the same ancestor, they don't share an ancestor with leopards. I suspect that you haven't gone far enough back down the phylogenic tree. Trace it back and you will find one and I bet it was a cat of some sort.
Further, evolution claims that man evolved from a rock, yet you tell me that tigers and jaguars can't have come from a standard template construct cat?
What I propose is exactly what evolution describes, but in a much more limited context.
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Salty fish.
Is any level of salt lethal to fresh water fish? No. The issue is the concentration of salt in the solution. Fresh water does in fact contain salt, but in much more limited concentrations than the ocean.
Now, if I took a goldfish and put it in a bowl of water from the ocean it would die quickly. The same would be true in the opposite situation involving a salt water fish in fresh water. But, what would happen if I were to take that goldfish and its offspring for hundreds of generations, and each generation steadily increased the amount of salt in the environment? With the increase in salinity would come an increase in the ability to cope with the salinity according to the basic principles of evolution. After a large number of generations the result would be a goldfish that cannot live in fresh water and can only live in salt water. The process could work the other way as well, ie salt water fish bred to be a fresh water fish.
The next step is to consider the oceans at the time of the flood. If the flood was universal, then there were no streams; all the world's water was ocean water. This water would have a lower salinity than today's oceans. Certain organisms would live in the water. As the flood waters ran off and evaporated, the world spanning ocean would divide into separate bodies of water. The salinity of the oceans would increase slowly and the animals in the ocean would adapt to that increase. These animals would be isolated from the animal living in fresh water and would specialize as required by the challenges of their environment. Isolated populations evolve different characteristics based on their environment. It is unsuprising that today's fish have specialized to live in their very different environments. It is simple, basic evolution at work.
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Population increase over time.
I did take into account which is why I limited the number of children per family to 5. Families much larger than that were common at the time of Noah and afterward. Jacob had 12 sons. I suspect there were a few daughters in there as well. The number of five was intended as conservative average taking into accound children which did not reach an age where they could reproduce or died before producing five children on there own. At the rate of 5 children added per generation a population of 1,000,000 could easily be reached in a mere 1,000 years. Noah and his decendants had much more than 1,000 years to produce the world population at the time of the Roman Empire.
I chose the number five becase it allowed for easy math. You could half that number and still be able to produce the actual world population in the allotted time. The main point is that it is plausible that Noah and his decendants could have populated the earth in a few thousand years. You contend that they can't, a contention that doesn't stand up to scrutiny.
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Technology of Noah's day.
You say metallugy isn't a marker of civilization, yet common classification of the development begins with stone age civilization moving to bronze and iron ages. How do you have bronze and iron ages? Metallugy. I didn't say that metallurgy was the one standard of civilization, merely that it is a marker or indication that the society is fairly advanced in its technological acumen. You casually dismiss writing as a marker of civilization, but I am unaware of any society which would be classified as a civilization which lacks the ability to write. (Writing is not just alphabets, but hieroglyphics and other pictoral based systems). All of the things I mentioned are offered to suggest that Noah and the civilization in which he lived wasn't the barbaric stupid bunch of stone age morons you envision. The mayans that you mention were a stone age people, yet were quite impressive in the scope of their accomplishments.
As for Noah's civilization. Assuming a world wide flood, one wouldn't expect archaeological excavations unearthing it. A global flood would have done an effective job of burrying it or destroying it to the extent that there is no evidence remaining of its existence. Following the flood a civilization quickly began in mesopotamia. The tower of babel incident spread these people throughout the world including India, China and Egypt where people bringing their skills from Babel quickly established flourishing civilizations.
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Different languages.
According to the Biblical description, the people at Babel all had the same language. The idea of anoter language was completely foreign. It was something they had absolutely no way of conceptualizing mentally. Suddenly people all around them are speaking gibberish. There are no teachers to instruct them in learning the language. The people speaking gibberish probably appeared to be insane. What other conclusion would one draw? Yesterday this guy spoke normally, today he is blabbering nonsensically. So you have a large city filled with people who think that everyone else is a luntic. How do you resolve disuputes when you have absolutely no idea what the other guy is saying. In many cases with violence. Weaker families would be forced to move away or be killed. The result is that people spread out and populate the world.