mariacostel wrote on Nov 13
th, 2015 at 7:05am:
PS stereoscopic vision isnt' easier' with two eyes. It is IMPOSSIBLE without. How would anyone determine stereoscopic vision was even better without knowing what it is - and it had to be done without any thought.
Well my assumption would be that at some point an organism with one eye/light spot had a generation which due to a mutation or several mutations gained two eyes. This then conferred better ability to determine food sources, which then confers better survival.
But I repeat can you explain the recurrent laryngeal nerve maria. Let me explain. The recurrent laryngeal nerve branches from the vagus nerve to control intrinsic muscles of the larynx. However it takes a convoluted pathway under the aortic arch up to the larynx. In giraffes it can be several metres long.
How does an intelligent creator account for this?
Evolution accounts for it beautifully in that in fish and our fishy ancestors the gills were behind the heart in comparison to the body so the laryngeal nerve could take a straight pathway, but as the gills/lungs moved to the front and in a different position, it was "easier" for the laryngeal nerve to lengthen and follow the lungs rather than forge a new pathway [/quote]
You use the word 'mutation' so easily. So imagine one person grew a second eye as the result of a mutation like the Elephant Man type. Now this one person breeds and gives birth to... a normal person with one eye. Mutations in a single organism are not passed on except in exceptional circumstances. It also does not account for why we still don't have singe-eyes species of humans.
You are ignoring all the facts of genetics and presuming way too much. [/quote]
All the facts? I studied genetics for years. Germ-line mutations are passed on from generation to generation
https://en.wikipedia.org/wiki/Symmetry_in_biology.
Again, though can you explain the recurrent laryngeal nerve.