The essential appositive in the sentence "astronomer maia mitchell discovered a comet in 1847 and went on to become the first professional female astronomer in the united states," is Maia Mitchel. The last option is correct.
An appositive consists on a noun or noun phrase that renames another noun right beside it. The appositive can be a short or long combination of words.
In this particular case, the words Maia Mitchell which is a proper noun is renaming the noun astronomer, which is right before it and constitutes the subject of the sentence.
The answer is report. The law requires that we report any suspicious activity to the police.
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It is practiced against a group’s own country by some to bring attention to specific problems in society.
An unreliable narrator is a narrator that cannot be trusted because his/her version of the story isn´t completely correct for various reasons, such as his/her mental state or the fact that s/he may not be objective.
The best example of an unreliable narrator is one who narrates the story from a first person perspective. Sometimes the readers know it from the very start of the story that the narrator is unreliable while other times this is revealed gradually throughout the story or even at the end of the story.