The correct answer is D. Enigma. The definition of this word would be a mysterios person, place or event. Something that is puzzling and that can not be understood or explained by the current knowlege. It does not mean that something is bad, it just means that it is unknown.
The correct answer would be option D, Sleep Rebound.
After 32 hours of exhausting work, he makes it home and discovers he is unable to fall asleep no matter how hard he tries. Hamid may be experiencing Sleep Rebound.
Explanation:
Sleep Rebound is called as REM rebound. REM stands for Rapid Eye Movement. When there is a lengthening and increasing frequency and depth of rapid eye movement, and this occurs when there is a sleep deprivation, then this is called as the REM sleep rebound.
So when Hamid had to wake up for more than 32 hours, due to his extra triple shifts at work, he tried hard to sleep after reaching home from this exhausting period, but was unable to sleep. This happened because he was awake for a lengthy period of time and due to sleep deprivation, now he is unable to sleep. So Hamid is experiencing Sleep Rebound.
Learn more about sleep rebound at:
brainly.com/question/14155959
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I believe the answer is A. new methods of perserving food for long journeys, like pickling.
This invention allow sailors to be on the sea trip longer without needing to transit to smaller videos every short period of time, which make it possible for the sea exploration to reach further distance that never been covered before
