Some People Customarily Sleep Only 1 to 3 Hours Per

question 91

Multiple Choice

Some people customarily sleep only 1 to 3 hours per night. Some have gone 10 days or more without sleep, apparently without suffering any medical harm. Observations such as these are considered evidence against the theory that

• A) the 24-hour cycles of sleep and wakefulness are generated within the body itself.
• B) the main purpose of sleep is to enable the body to repair and restore itself.
• C) sleep consists of four separate stages, plus REM sleep.
• D) dreams are the result of the brain's attempt to synthesize all the information that activates it.

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Definitions:

Gallflies

A group of insects known for their ability to induce gall formation on plants, where they then live and feed.

Intermediate Gall Sizes

Refers to the medium range of sizes for galls, which are abnormal growths on plants caused by various organisms.

Stabilizing Selection

An evolutionary process that favors the intermediate variants of a trait, leading to a decrease in variation around a certain phenotype, often maintaining the status quo in a population.

Natural Selection

The process by which organisms better adapted to their environment tend to survive and produce more offspring, driving evolution.