Why does Iago tell Montano that “I fear the trust Othello puts him in, on some odd time of his infirmity, will shake this island,” and what does it mean

Ineed to write a write a 4–5 paragraph compare and contrast essay that addresses how anne frank matures over the course of writing her diary.it's also a compare and contrast essayi just got put into this new class and i don't know if we were supposed to already be reading and the essay is due today and i haven't even started it nor read the book, someone me what do i do