"Everything is very different."
Traduzione:Tutto è molto diverso.
It is "molto" and not "molta" because in this case "very" is used as an adverb. "Molto" may be an adverb, an adjective or a pronoun. When "molto" is used as an adverb is indeclinable while it may change in gender and number when it is used as an adjective or as a pronoun.