Michael ... The Randomness of Evolution is a powerful force within the present cycle of Existence.
In Australia we have Rivers that are dry for 99.99% of the time. When a Cyclone manages to cross the Great Dividing Range in Northern Queensland it dumps millions of litres on the far side of the range. This flows down towards the dry Inland Sea (Lake Eyre) through rivers with names like, The Paroo, Coopers Creek and The Diamantina.
The fall of the river beds in these areas can be as low as 10 millimetres every 100 metres. Consequently as these rivers flood they are free to spread and can reach between 30-60klm in width.
With such a low fall rate, a small rock, a tree branch, a dead kangaroo, all of these can easily alter the the course of the headwaters of the approaching flood, and have a direct impact on the course of the river.
I see the Randomness of Evolution in the analogy of these Rivers. Evolution can change its course at the smallest of setbacks or opposition to its flow. It simply goes with the flow. Provided the new 'direction' is a successful selection it will continue on that course, until a better selection reveals itself.
In this regard your post is perfect. We see eye to eye in this matter.
cheers ..... greg


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