Answer:
darkness, an object, shadows... Many things can cover up someone's view. Also blindness. A blindfold can cover someone's view was well.
Explanation:
This is all as if we were talking literally. If we were talking, let's say, morally, we would say darkness, fear, despair, etc. :)
Burning gasoline produces carbon dioxide.
B. A teacher travels each year to visit family in South Africa.
False, there is always room for bias in science
