Judith Carney has documented the introduction of this plant by African slaves to the Americas, leading to its eventual global popularity
A) Sorghum
B) Millet
C) Corn
D) Rice
E) Yams
D
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If the rate at which we produce CO2 were to stop rising, the levels of CO2 in the atmosphere would
A) eventually level off. B) continue to rise. C) decrease as CO2 is absorbed by plants, soils, and the oceans. D) This cannot be reasonably predicted.
What was the main period of colonization by European states?
A) 1300 through the 1600s B) 1400 through the mid-1550s C) 1500 through the mid-1900s D) 1700 through the 1800s E) the 1800s
Carbon dioxide concentrations in soil are ________ than in the atmosphere because of ________
A) lower; transpiration B) lower; plant photosynthesis C) higher; decay of dead plants and animals D) higher; ongoing respiration in the ground
Critical Thinking
In the accompanying figure, how much is the combined expenditure per year needed to eliminate hunger and malnutrition, and restore fisheries? This amount is equal to the sum of which two U.S. expenditures in 2008?
What will be an ideal response?