New genetic traits upon which natural selection can act usually arise from
A) mutations and crossover.
B) increases in cell size and shape.
C) the desire to become adapted to a new environment.
D) the wish to make evolutionary progress.
A
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If the temperature drops and the amount of moisture in the air remains unchanged, the relative humidity will increase.
Indicate whether the statement is true or false
Which of the following statements is false?
a. About 1.2 million people are killed worldwide annually in motor vehicle accidents. b. Motor vehicles are the largest source of air pollution. c. More Americans have been killed by automobiles than on battlefields in all U.S. wars. d. In the United States, more than 40,000 people die annually in motor vehicle accidents. e. Motor vehicles are second only to industry as a source of air pollution in the U.S.
Use the wind chill chart in Figure 7.1 to determine the wind chill temperature for each of the following examples:
a) Wind speed: 24 kmph, air temperature: 234°C 5 wind-chill temp: b) Wind speed: 48 kmph, air temperature: 27°C 5 wind-chill temp: c) Wind speed: 8 kmph, air temperature: 1 4°C 5 wind-chill temp: d) Wind speed: 56 kmph, air temperature: 223°C 5 wind-chill temp:
The U.S. and China currently rely on fossil fuels for how much of their energy needs?
A. 66 percent B. 50 percent C. 25 percent D. 90 percent