a poem that does not have a set rhyme scheme or set meter
A free verse poem is just that, a poem that is free. It is free of all rules or constraints. It does not have a set rhyme scheme or set meter. Rhyme scheme is the pattern in which rhymes line. For example, Shakespeare's sonnets have a particular rhyme scheme labeled ABAB CDCD EFEF GG. Meter is the pattern of stressed and unstressed syllables in a poem that creates a rhythm.
Blank verse is a poem that has a specific meter but no rhyme scheme.
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A. A has both genders of the students and since we don’t know the amount of students of either gender, this serves as an indication that not all the students are of one gender or another.
#2 and #4 for sure, I'm not sure about the others. Probably not the first one.