A Complete Lack of Color Vision Is Very Rare and Occurs

question 100

Multiple Choice

A complete lack of color vision is very rare and occurs when an individual has:

• A)only two types of cones.
• B)only one type of photoreceptor, rods.
• C)an excessive number of cones.
• D)a complete lack of red cones.

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Definitions:

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Pleasure Principle

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A framework for understanding the thoughts, emotions, and behaviors that make up an individual's personality.