The roaring 20s, hope that helps :)
Answer:
The correct answer is C. ecosystem
Explanation:
I got the answer correct on usatestprep.
If you’re talking about supply and demand, demand is how much people want of something, and the suppliers how much of it is available. If there is more demand then there is supply, the price of the product will go up. If there is more supplied and there is demand, the price will go down.
Environmental factors interact with Circadian rhythms to regulate sleep cycles, Daylight triggers a process that induces the pineal gland to end melatonin production; alert in the early afternoon; alert in the late afternoon.
Circadian rhythms are regulated by the brain's Suprachiasmatic nuclei (SCN), which are located in the hypothalamus. Circadian rhythms regulate daily biological arousal. Circadian rhythms are physical, mental, and behavioral changes that follow a daily cycle.
Circadian rhythms are intrinsic, biological rhythms that can be entrained such as physical activity and work cycles. A pair of cell clusters in the hypothalamus that controls circadian rhythm. Environmental cues can help keep circadian rhythm synchronized. The most important environmental cue is sunlight.
To learn more about Circadian rhythms here
brainly.com/question/857658
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