How does Mercutio act as a foil for Romeo?

Mercutio, the witty skeptic, is a foil for Romeo, the young Petrarchan lover. Mercutio mocks Romeo's vision of love and the poetic devices he uses to express his emotions: Romeo, Humors! ... He advocates an adversarial concept of love that contrasts sharply with Romeo's idealized notion of romantic union.

Explanation:

the universe is complete credible source of our oxygen

what were the pronouns? did it use i, me, and my? if so, it was first person. if it had pronouns like you and your it was second person point of view. if it used he, she, and they, it was 3rd person point of view.