A.   an anatomical feature used in the manner for which it was originally selected.

B.   the series of apparent adaptations that are never actually used.

C.   a phenomenon that occurs before natural selection can occur.

D.   the use of an anatomical feature in a way unrelated to the feature’s original function.

A.   primate exhibits a derived trait for an enhanced sense of smell, since this trait is not commonly observed in mammal species.

B.   primate must be a species of prosimian, as that suborder of primates relies heavily on the sense of smell for many aspects of daily life.

C.   species is nocturnal.

D.   is a species of anthropoid because it has an increased reliance on vision.

A.   have specialized digestive anatomy for eating leaves.

B.   are mostly frugivorous.

C.   are referred to as “cheek pouch” monkeys.

D.   are usually terrestrial.

A.   an enlarged olfactory bulb and enlarged scent glands.

B.   a reduced number of teeth.

C.   a larger brain.

D.   smaller eye orbits.

A.   among the most endangered animal species due to disease.

B.   not highly adaptable to changing environments but do well in zoos.

C.   among the most endangered animals due to human exploitation of resources.

D.   a healthy population living in a subtropical environment.