That Sir is a very good point
Simultaneous, parallel or overlapping construction.
The serial pyramid evolution premise is based solely upon the idea of royal succession .
Whether that is or is not the case is another issue.
Consider two jetliners one built by Airbus the other built by Boeing.
Same design brief. Range, Payload, Speed, Fuel consumption.
Both design contemporaries. Of similar appearance. Both designed to address the same problem. Both designed in an identical technological context.
However both designed by different design bureaus.
Result. Evolutionary convergence. Superficially/functionally similar but in all other ways totally dissimilar.
Post Edited (16-Jun-15 20:22)