Our Sleep Rhythms Tend to Follow an Exact 24-Hour Day

question 649

Multiple Choice

Our sleep rhythms tend to follow an exact 24-hour day because

• A)the time of peak activity is invariant from person to person.
• B)they are tied to external time markers like light and dark.
• C)they have adapted to technological improvements made in the last century.
• D)everyone needs at least eight hours of sleep every night.

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Definitions:

Real GDP

The measure of a country's economic output adjusted for price changes (inflation or deflation), providing a more accurate reflection of an economy's size by valuing goods and services at constant prices.

Price Level

The average of the current prices of all goods and services in an economy, often compared to a base year's prices to assess inflation.

Aggregate Expenditure

The total spending on final goods and services in an economy, including consumption, investment, government spending, and net exports.

Marginal Propensity

The tendency of an individual or household to spend an extra unit of currency, reflecting the change in consumption from a change in income.