The earliest fish had
a. plated skin. d. lungs.
b. jaws. e. ray-fins.
c. spiny skin.
A
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The number of electrons ejected in the photoelectric effect depends on the
A. brightness of incident light. B. frequency and wavelength of light. C. wavelength of incident photons. D. frequency of incident photons.
As shown in the Discussion Starter of this chapter, 26% of the 9.6 quadrillion Btu of renewable energy in 2014 came from hydroelectric plants. How much coal is saved (not consumed) because of the hydroelectric plants? Assume coal has an average energy content of 10,000 Btu per pound and a coal-fired power plant has an efficiency of 36% and a 6% loss in the transmission lines.
What will be an ideal response?
Which one of the following global climate changes is most associated with increased hurricane activity?
A) Increased desertification in Africa B) Warmer oceans C) Melting polar ice caps D) Melting glaciers in Alaska
What geographic, political, and other factors have contributed to economic growth and stability in the United States and Canada?