Multiple Choice
The human retina contains about ________ rods and about ________ cones.
A) 60 million; 3 million
B) 9 million; 120 million
C) 32 million; 320 million
D) 120 million; 6 million
E) 160 million; 3 million
Correct Answer:

Verified
Correct Answer:
Verified
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