Multiple Choice
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
Correct Answer:

Verified
Correct Answer:
Verified
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