21.   But although the mutations are random, the cumulative change over the generations is not random.

22.   Ideas about immorality and what constitutes dishonourable conduct change over time, but the views of judges change more slowly than most.

23.   But Sherborne has seen many changes over the years.

24.   It has undergone drastic changes over the past few years.

25.   The German railway system is facing major structural changes over the next few years as it struggles to rebuild its share of the transport market.

26.   And a host of structural and policy changes over the last couple of decades have made the U.S. economy less inherently prone to inflation.

27.   A broken input shaft doomed Dixon at Baytown, prompting a series of equipment changes over the ensuing two weeks.

28.   A noticeable change over the years is that the spellers are more socially mature.

29.   Accurately accounting for changes over time soon becomes more important than the number chosen for the amount of poverty in the year the new standard is adopted.

30.   According to Merrell, a sibling relationship changes over time.