Why does the text say there is a greater density and cultural diversity of Native Americans living in California, than in the rest of North America, prior to European contact?
A) A greater number of tribal conflicts caused groups to split and become isolated.
B) The mild climate and rich diversity of resources.
C) Past periods of disease forced isolation between many groups that led to cultural uniqueness.
D) The flat terrain and lack of wetlands in the Central Valley drew many Native American immigrants from the surrounding Aztec, Mayan, Great Basin and Puget Sound tribes.
B
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Which shape is likely to need more material for a critical mass, a cube or a sphere? Why?
A) a sphere because it has the greater surface area to volume ratio B) a sphere because it has the smaller surface area to volume ratio C) a cube because it has the greater surface area to volume ratio D) a cube because it has the smaller surface area to volume ratio
A compact region of vertical updraft within a thunderstorm is a(n) ____________________
Fill in the blank(s) with correct word
The Mesozoic Era began approximately ________ years ago.
A. 531 million B. 252 million C. 2.6 million D. 65 million E. 4.55 billion
A weather forecast for up to a few hours (usually not more than 6 hours) is called a(n) ____________________ forecast, or ____________________
Fill in the blank with correct word.