Originally it was believed that we had ________ (kinds of) cells that transduce light into neural impulses; according to research reviewed by your authors it is believed that there are ________ (kinds of) cells that transduce light into neural impulses.
A) two; four
B) two; three
C) three; four
D) four; two

Question

Quizplus · Accepted Answer

There are two types of cells that transduce light into neural impulses: rods and cones.

Originally It Was Believed That We Had ________ (Kinds Of)