The correct answer is "Business Cycle." Economic growth, peaks, economic downturns, and troughs are part of the Business Cycle. It is the downward and upward movement of levels of gross domestic product (GDP) and refers to the period of expansions and contractions in the level of economic activities (business fluctuations<span>) around its long-term growth trend.</span>
Resources are characterized as renewable or nonrenewable; a renewable resource can replenish itself at the rate it is used, while a nonrenewable resource has a limited supply. Renewable resources include timber, wind, and solar while nonrenewable resources include coal and natural gas.
The systematic study of human population is called, demography.
