PT 29 S2 Q17

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

Which one of the following statements best expresses the main idea of the passage?
(A) neuro-physiological studies have established that the bill of the platypus is one of its primary sensory organs.
(B) ...
(C) ...
(D) ...
(E) ...

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