Final answer:
The movement of peoples does cause environmental and linguistic changes due to the introduction of new cultures and pressures on resources. Historical events such as the market revolution and the temperance movement in the U.S. were influenced by population movements. Linguistic studies show divergence can occur from migration and social change but is not due to brain structure differences.
Step-by-step explanation:
True, the movement of peoples has indeed caused environmental and linguistic effects. As populations move, they bring with them their languages and cultures, which can mix with or replace the local languages and customs. This can lead to the formation of new dialects and languages or to the extinction of others. Additionally, the movement of people significantly impacts the environment as it may increase the demand for land, water, food, and energy. This can lead to habitat destruction and altered landscapes.
For example, during the market revolution in the United States, there was significant social and economic change. Similarly, the temperance movement reflected new social conditions, such as increasing urbanization and immigration. Also, the acquisition of land and the resulting policies towards Native Americans in the U.S. were indeed influenced by the movement and expansion of European descendants.
In the study of linguistics, reasons for linguistic divergence might include migration, social variables, and political changes—but not different brain structures among groups. The study of languages opens up insights into history and culture, and despite there being over 6,000 languages, exact numbers are difficult to determine due to various factors including evolving language dynamics.