What was the population of the Earth (as of the book's publication)?

A) over 7 million
B) nearly 2 billion
C) over 7.4 billion
D) 670 million
E) nearly 2 trillion


C) over 7.4 billion

Environmental & Atmospheric Sciences

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All the following traits show genetic variation in humans except

A. hair color. B. neck length. C. hair length. D. eye color.

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Africa has large urban areas.

Indicate whether the statement is true or false.

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IPM (integrated pest management) is becoming widespread as a way to control pests. This method

A. first uses chemical controls to maximize yields. B. has been shown not to be effective in commercial agriculture. C. first uses cultivation such as intercropping, then uses biological controls, and then uses chemical controls in hard hit areas. D. uses a mixture of several modern pesticides applied at one time. E. first uses chemical controls, then biological controls and then cultivation.

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The Transcontinental Arch represents portions of the Canadian shield not covered by seas in the Sauk

transgression. Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences