After a meal, _____ levels are likely to be raised. After a brief fast, _____ levels are likely to be raised.
Fill in the blank(s) with the appropriate word(s).
insulin; glucagon
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Why are organic reefs useful paleoecological indicators?
A)Organisms only form limestone reefs in cold, tropic waters. B)Organisms only form limestone reefs where there is a great abundance of mineral matter in the water. C)Organisms only form limestone reefs in warm, clear, shallow water. D)Organisms in the modern world only form limestone reefs between 30 degrees north and south of the equator. E)Modern organisms only form limestone reefs in warm, clear, shallow water, between 30 degrees north and south of the equator.
The most important source of carbon monoxide emissions in the United States is
A) natural emissions. B) automobile engines. C) coal-fired energy plants. D) industrial processes.
The responsibility for complying with US federal air quality standards lies with
A) individuals. B) individual states. C) tri-state regions. D) the federal government.
The effect of winds on pollution dispersal is such that
A) the concentration of air pollutants is directly proportional to the wind speed. B) forced convection decreases with increased wind speed. C) strong horizontal winds will lead to some vertical distribution of pollutants. D) changing direction of wind has no significant impact on the rate of pollution dispersal.