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Circadian rhythms are controlled by ____________________, so people's sleep-wake cycles are ____________________.
Variable Costs
Costs that change in relation to the level of goods or services produced, such as materials and labor, in contrast to fixed costs.
Total Revenue
The total income generated from the sale of goods or services before any expenses are subtracted.
Variable Costs
Expenses that change in proportion to the activity of a business, such as costs for raw materials and labor.
Fixed Costs
Expenses that remain constant regardless of the amount of production or output, like lease payments or wages.
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