1.   During the industrial era, our political system evolved to respond to the needs of a mass society.

2.   Social systems evolve in close relation to ecology.

3.   He pointed out how the existing tax system had evolved so as to encourage the unfettered growth of car ownership and the transport of freight by lorry.

4.   An elaborate social system is evolving here between American military guards and their captives from the Afghan war.

5.   As these simple systems evolve, Whitesides said, it should be possible to explore the dynamics of interacting particles and perhaps model biological principles.

6.   A complex storm system will slowly evolve across the middle part of the nation.

7.   A system of incentives evolved using premium pay to reward exceptional performance and efficient use of tractors.

8.   But in Palestinian areas, no such system has evolved, leading to widespread fear about the fate of property rights.

9.   But increasingly, he said, the Federation system will evolve as an agent that marshals funds and provides choices for independent and Federation donors.

10.   In India, some scholars say the system is evolving rapidly, producing anomalies.