In microevolutionary a good example is House sparrows. They were brought to North America in 1852. Since they have been introduced, the sparrows have evolved unique characteristics in different locations. Sparrow populations in the north are actually larger than sparrows in the south. This divergence in populations is might be the reason of natural selection. In theory the larger birds can often survive lower temperatures than smaller-bodied birds can.
After all of the research I have done on macroevolution and microevolution I have came to the conclusion they are very important for life to exist. Life on earth must keep improving and evolving because there is something that can always be improved. People can always be faster, stronger, and smarter. I believe it is important for life to continue evolving until all life on this planet is perfect, which is next to impossible. If evolution can improve if we could develop a way after thousands and thousands of years to breath without oxygen. We would be able to go into space and underwater with no problem.