While I suppose "informed best guess" might be possible, I don't see how this 'intelligence' makes it into the process. Liver more stressed in this particular o

While I suppose "informed best guess" might be possible, I don't see how this 'intelligence' makes it into the process. Liver more stressed in this particular organism? Tweak the DNA in the reproductive organs. I don't think we even have a theory that could explain how that should work. Maybe we'll get there one day. But I suspect, as has been demonstrated in labs with bacteria, that it really is random. When their environment begins to show signs of contamination, the bacteria's inner workings don't use an "informed best guess" when mutating for reproduction - the random changes result in bacteria suited for death with exposure to the contamination, and bacteria that are more resistant to the contamination. Guess which ones survive to pass on the trait.