PT 29 S2 Q18

Scientists have long known that the soft surface of the bill of the platypus ... ...

During the studies supporting Bohringer's finding, as they are described in the passage, which one of the following occurred before a nerve impulse reached the motor cortex of the platypus?
(A) The electro-receptors sent the nerve impulse to the fifth cranial nerve.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: Science & Technology Mix 2