Question

Circadian rhythms are the changes that take place in your body and behavior during each period of approximately 24 hours. Changes in your body temperature and appetite level are examples of circadian rhythms. But the circadian rhythm we’re interested in is your sleep-wake cycle. Part of the sleep-wake cycle is the release of a brain chemical called melatonin into your bloodstream. Melatonin makes you feel sleepy. During your teen years, melatonin is released later in each 24-hour cycle than it was when you were a child. As a result, if you’re a typical teenager, you don’t start getting sleepy until 11:00 p.m. or even later. And since melatonin stops being released around 8:00 a.m., that’s about the time you naturally stop feeling sleepy—no matter what time you go to bed. Teens may brag about getting by on only five hours of sleep. Yet scientists have known for a long time that teens need around 9 hours of sleep each night—that is, if they want to function at their best.
Which supporting detail best supports the main idea?


Yet scientists have known for a long time that teens need around 9 hours of sleep each night—that is, if they want to function at their best.


Circadian rhythms are the changes that take place in your body and behavior during each period of approximately 24 hours.


Teens may brag about getting by on only five hours of sleep.


Part of the sleep-wake cycle is the release of a brain chemical called melatonin into your bloodstream.

Answer 1

The statement about melatonin as the chemical that regulates the sleep and wake cycle is the supporting detail. Thus, option D supports the main idea of the passage.

What is a supporting detail?

Supporting detail is a statement that includes the data that are well researched and have examples and detailed descriptions that support the central idea that serves the purpose of the essay.

The main idea is the central thought that the passage wants to deliver to its reader and is supported by the details that clarify the idea about the topic.

Here the main idea is about the sleep cycle that is regulated by the hormone melatonin released by the brain. It balances the sleep and the wake cycle of the person and varies with the age. Its release controls the sleep pattern and regulates the best function of the body.

Therefore, the release of melatonin best supports the idea of the passage.

Learn more about supporting details here:

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