A part of speech that is used in a sentence before a noun to signify a single or the certain
noun

Preposition is before a noun to signify a single or the certain noun.

Explanation:

I hope this helps.

in   ¨and yet the books¨   by czelaw miloz the tone is positive since it tells us that when we touch a book, it starts to live and the perspective is in the third person and turns once into the first person. in "the rhinoceros" by eugene ionesco the tone is illogical and absurd   and the perspective is in the third person since it is a play.

the krebs cycle and electron transport occur in the mitochondria, though other than that i would need to know more information.