Overcrowding and slums developed in many impoverished countries in the 20th century, mostly due to large migrations to cities from people looking for work.
Pacific,arctic, and atlantic oceans
Answer:
1:A, as the primary sector is for the extraction of raw materials and logging includes the extraction of the raw material of wood.
2:C, as the Tertiary sector is in charge of service, downloading music is a service.
3:Shanna would be in the secondary sector as the secondary sector is in charge of manufacturing goods, vehicles, ect