A monopoly is when one business or provider buys out all of the other companies or organizations in an industry. This makes it to where one company controls the entire industry and their company gets all of the money being earned.
It increases pollution expecially in rivers killing many animals and causing deforestation
Migration is seasonal movement of animals from one region to another. A nomad is someone who has no personal home, and they travel from place to place for a variety of factors like crops and fresh pasture for livestock.
Hope this helps you create sentences.