It is likely that pterosaurs buried their eggs in underground nests, allowing the eggs to soak up water and gain mass during incubation, a technique used by modern lizards and snakes.

The inflow silver needs the equivalent the commodity to exchange inevitably, therefore attacks very in a big way to the Ming Dynasty society, the mass productions gain commodity of the silver.

Every one in this network is influenced by network effects. The first network that reaches the critical mass would gain competitive advantage under the force of positive feedback.