how do you explain our convoluted fine motor system?
When you wish to move a single finger it's not all that simple. With the exception of mammals and primarily in primates, there is simply no mechanism or possibility to move a single finger or claw. They can only grasp with their entire hand or paw utilizing their Pyramidal motor system which provides no control at all over the individual digits.
In the few animals that are able to move a single digit there is no direct method available. The pyramidal motor system orders your entire hand to grasp and the extra-pyramidal motor system has developed a new ability. In animals previously identified as immediate ancestors to humans - the extra-pyramidal motor system is able to tell individual fingers to ignore the pyramidal motor system and only through this mechanism can any animal control individual fingers.
To be clear - the pyramidal system orders all of your fingers to move, just like it does in every other animal. In animals previously identified as human ancestors, their extra-pyramidal system is able to tell individual fingers to ignore the the pyramidal system and that is why we can move individual fingers.
Can you explain the behavior behind our fine motor skills without evolution?
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