At about 23-25 mya apes diverged from monkeys. Which is an unfailing ape trait:

Question

At about 23-25 mya apes diverged from monkeys. Which is an unfailing ape trait: a.A 2.1.2.3 tooth formula. b. Y-5 lower molar pattern. c. Bilophodont molars. d. Quadrupedal locomotion. Oligocene primates including, the Aegyptopithecus zeuxis family, are important: a. Because it is possible that all modern Old World monkeys and apes are derived from this family. b. Because all members of this family were quadrupedal and lived in trees, which is the typical form of locomotion of Old World primates. c. Because sexual dimorphism in the family exceeded dimorphism observed in other Oligocene primate families and sexual dimorphism becomes an important anthropoid trait. d. Because most species of this primate family were primarily frugivorous and fruit later becomes an important item in the diet of monkeys. Match each of the terms in the left group with its most appropriate counterpart in the right group. Where do each of these primates live?

Explanation / Answer

39. Unfailing ape trait is Y-5 lower molar pattern, which is five cusps, or raised points, on their grinding surfaces.

40. The importance of this ape lies in the fact that: they were quadropedal and lived on the trees.

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