Explanation:
Iago doesn't get picked to be is assistant, Iago is also extremely racist towards Othello.Roderigo loves Othello's wife.Iago is trying to manipulate Othello, he acts different around different people.He is blinded by his affection to Desdemona that he doesn't even pay attention.He tells Desdemona's father that they have gotten married.He wants Brabantio to leave at the beginning, but then he realizes Brabantio is telling the truth, He would rather Desdemona be married to a white man than Othello.To upset Brabantio and there was a magic spell put against her.
I can't answer these questions exactly