Which of the following is not a major controller of investment, production, and consumption of goods?
A. the United States
B. Japan
C. Western Europe
D. China
D. China
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How long ago did the big bang catalyze the beginning of the universe?
a. 13.7 billion years ago b. 1.37 billion years ago c. 4 billion years ago d. 40 billion years ago
The amount of biomass on successive trophic levels in a food chain forms a pyramid in which the biomass on trophic level N+1 is only 20% of the biomass on trophic level N. If pesticide P is transferred from one trophic level to the next with 100% efficiency, what will be the concentration of P on trophic level 5 if the concentration of P on trophic level 2 is 4 parts per million (ppm)?
a. 500 ppm b. 2500 ppm c. 20 ppm d.100 ppm
How have scientists used isotopic analysis to determine that the rise of atmospheric CO2 is mostly from the burning of fossil fuels?
A) 14C concentrations are much higher in urban areas than in rural areas, indicating fossil fuels must have a higher 14C/12C ratio than carbon from other sources. B) Since 14C is an unstable isotope, scientists have dated the atmospheric carbon to the period since the Industrial Revolution. C) Both coal and oil contain a high proportion of 14C. By analyzing 14C/12C ratios, scientists have been able to determine the source based on this fact. D) The decrease in ratios of atmospheric 13C and 14C to 12C indicates that the source is fossil fuel carbon.
How is compost used?
A. It is used as animal feed. B. It is used to generate energy. C. It is used as building material. D. It is used to enrich soil.