Which is a long-term effect of sleep deprivation? weak immune system trouble concentrating impaired motor skills difficulty staying awake

It was actually "weaker immune system". Just took the test and got it right.

Explanation:

     All the other answers are short term effects. If you don't sleep for a day, your movements would be slower, you would be more tired and wouldn't be able to concentrate. However, if you just miss one day of sleep, your immune system ain't gonna suffer.

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note: for words found inappropriate, i spelled them out in the phonetic alphabet in parenthesis, so take the first letter of each word to get the word i was trying to spell