Talya wrote:
Every part of the human body serves (or served) a purpose. And frequently, they could have served that purpose better with better design. (See shared respiration/ingestion pathways.)
Every design has compromises of size, weight, and space. More importantly,the human body is not a collection of individual parts. The entire body is deisgned for the life experience of humans, and it is beyond the capacity of human scientists to criticize the design as suitable for that purpose.
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That's supposing human beings have a purpose, he doesn't speak under that pretense.
Then there is no way to criticize the human body's design.
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His main point is just that we're very underdeveloped as beings. Certainly not the pinnacle of what we could be. The only thing that keeps us alive is that we're intelligent, social animals.
His point isn't that we're "underdeveloped" at all. There is no such thing as the "pinnacle of what we could be", either. Saying that "the only thing keeping us alive is that we're intelligent and social" is tautological. Duh. The only thing keeping lions alive is the fact that they're a predator that can eat gazelles and wildebeasts and such. They're not the "pinnacle of what they could be" either.
What he's saying is that individual qualities of the human body seem inadequate or poorl;y designed from the perspective of an engineer. The problem with that perspective is that engineers design objects around highly specialized purposes. The human body is designed to support the life and all the life experiences of an intelligent social animal. Engineers and physicists are not qualified to state what is or isn't a good design for that. No one is. Human knowledge is nowhere near being able to do that.
We can correct individual problems like Down Syndrome (which, all semantic quibbling aside, is a form of damage - there is a default range of qualities that a healthy adult has, and Down Syndrome prevents that from developing while offering no offsetting advantage; it is a significant impediment to the quality of life for those that suffer from it) but as far as understanding the purpose the body serves well enough to say things like "we're nowhere near the pinnacle of where we could be", no, no one can make an assessment in that regard.