Answer to Question 1
A business cycle is the periodic but irregular up-and-down movement in production and jobs. It has two phases and two turning points. As the economy slows and the growth in real GDP turns negative, the economy enters the recession phase of the business cycle. At the bottom of the recession phase is one turning point, the trough. As the economy moves through the trough, it enters the expansion part of the business cycle during which real GDP grows. Finally, as the economy reaches its high point and swings from an expansion to a recession, the economy passes through the other turning point, the peak.
Answer to Question 2
D
The life cycle of Plagiorhynchus cylindraceus, an intestinal parasite of birds.
ovarian cycle
The Sunspot Cycle
Norepinephrine and the Sleep–Waking Cycle
Photorespiration and the C4 Cycle
CO2 follows glacial cycle