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The three cone opsins peak near red, blue and:

AGlass
BGreen
CGrey
DGold
Answer & Solution
Correct answer: B. Green
1. The peaks are 564, 534 and 420 nanometres. 2. Two of the three colours are named. 3. The third is green. _Source: OpenStax Anatomy and Physiology 2e, Chapter 14, Special Senses._
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