The Great Ice Age Accounted for the Origins of North

question 45

Multiple Choice

The Great Ice Age accounted for the origins of North America's human history because

• A) it exposed a land bridge connecting Eurasia with North America.
• B) the glacial withdrawal allowed migration from South America.
• C) the glacial withdrawal formed freshwater lakes that supported life.
• D) when it ended, European migration to the west became possible.
• E) it prevented the migration of dangerous animals from the Bering isthmus.

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Definitions:

Brightness

A visual perception describing how luminous or vivid a light source or color appears to be.

Trichromatic Theory

A theory of color vision based on the existence of three types of cones in the retina that are most sensitive to blue, green, or red light.

Nobel Prize

A set of international awards given annually in several categories such as Physics, Chemistry, Medicine, Literature, and Peace, to individuals or organizations who have made significant contributions to humanity.

Wavelength

The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave, which is related to the wave's frequency and energy.