Answer
Primary sector: The primary sector of an economy is the sector that produces raw materials, such as agriculture, forestry, fishing, and mining.
Examples of services that a business such as AEC could require: Accounting services, marketing services, legal services.
Examples of natural resources that other firms could provide: Raw materials, energy, water.
Reasons why the relative importance of the primary sector of Country X's economy has declined: Increased consumer incomes, technological advances, and increased demand for services and manufactured goods.
Government minister's statement: The secondary sector of industry, which includes manufacturing, construction, and energy production, will always be more important than the tertiary sector, which includes services such as healthcare, education, and hospitality.