<span>There is an organ in the brain sensitive to light changes, which then affects our sleepiness.
This sensitivity to light changes will determine our response to melatonin that influences our level of 'tiredness'.
The more melatonin that we have in our body, the more likely we feel sleepy and fall asleep.</span>
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Free market system: A free market is an economic system that allows supply and demand to regulate prices, wages, etc, rather than government.
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I beleive the answer is b. Socail Contact.
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The origins came from the influence of the British colonizers and immigrants from Germany, Africa, and Dutch.
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