How Many Sleep Cycles Does a Person Typically Experience Over

question 61

Multiple Choice

How many sleep cycles does a person typically experience over the course of one night?

• A) one
• B) two
• C) three
• D) four or five

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Definitions:

Mean Global Temperature

The average temperature of the Earth's surface as measured across various global locations over a specific period.

Degrees Celsius

A unit of temperature measurement in the metric system where water freezes at 0 degrees and boils at 100 degrees under standard atmospheric conditions.

CFCs

Chlorofluorocarbons, a group of odorless manufactured chemicals that damage the Earth's ozone layer and have been phased out in many applications due to environmental concerns.

Mean Surface Temperature

The average temperature of a planet's surface, calculated from a wide range of locations and times, indicative of its climate health.