Solution:The sector of an economy that makes direct use of natural resources is known as the primary sector. Some of the common primary sectors are agriculture, forestry and fishing, mining, and extraction of oil and gas.The tertiary sector is also known as the service sector. It provides services, rather than producing material commodities. Some of the common primary sectors are retail, banks, hotels, real estate, education, health, social work, computer services, recreation, media, communications, electricity, gas and water supply.