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

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

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

B.   species is nocturnal.

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

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

A.   are usually terrestrial.

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

C.   are mostly frugivorous.

D.   have specialized digestive anatomy for eating leaves.

A.   a larger brain.

B.   a reduced number of teeth.

C.   smaller eye orbits.

D.   an enlarged olfactory bulb and enlarged scent glands.

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

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

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

D.   a healthy population living in a subtropical environment.