Acharacteristic that differentiates apes from old world monkeys is . the lack of a third premolarb. more massive jawsc. a suspensory shoulderd. downward-facing nostrils

The shape of the nose of monkey is one of the most important and reliable means of distinguishing Old World Monkeys from the New World Monkeys.

Explanation:

In New World Monkeys, who are also known as Platyrrhini, which means “flat nosed”, the nose is broad and the nostrils are set wide apart, while in the apes and Old World Monkeys, who are also known as Catarrhini meaning “downward nosed”, the nostrils are set close together which are either pointed downward or forward and are separated by a very narrow septum.

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