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It creates greater warmth around figures and gives the scene a more dream-like appearance. So it is C
It is the day of the dead celebrated by people of Mexican ancestry.
If you don't have a book to help you with this, then it's undeniably the teacher's fault - if you do, you either want to provide it to us, or look at it to obtain your answers.
Dramatic global cooling with the oceans freezing to a depth of perhaps 1000m