Which of the Following BEST Describes the Evolutionary Basis for Variation

question 45

Multiple Choice

Which of the following BEST describes the evolutionary basis for variation in human skin color?

• A)Skin color is lighter at high latitudes than it is toward the equator.UV radiation is weaker at high latitude,so we don't need to protect against the breakdown of folate.Lighter skin color permits enough UV to be absorbed to build vitamin D.
• B)Skin color is lighter at high latitudes than it is toward the equator.UV radiation is weaker at high latitude,so we need light skin to allow the buildup of folate.UV radiation is too weak to break down vitamin D.
• C)Skin color is darker near the equator.UV radiation is stronger there,so we need dark skin to protect us from folate breakdown.Enough UV radiation will still be absorbed to provide enough vitamin D.
• D)Skin color is darker near the equator.UV radiation is stronger there,so we need dark skin to protect against vitamin D breakdown.Enough UV radiation will still be absorbed to provide enough folate.
• E)A and C together make up the best explanation.

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Definitions:

Normal Consciousness

Refers to an individual's psychological state when awake and aware of their thoughts, feelings, and environment.

Cocaine

A powerful stimulant drug derived from the leaves of the coca plant, known for its potent effects on the nervous system.

Barbiturates

A class of drugs derived from barbituric acid, used as sedatives and hypnotics, which can depress the central nervous system.

Caffeine

A stimulant compound found in coffee, tea, chocolate, and many soft drinks, which acts on the central nervous system to reduce tiredness and improve concentration and focus.