On mainland Southeast Asia, what is the most common crop in the lowlands?
A) sugarcane
B) rice
C) rubber
D) coconuts
E) opium poppies
B) rice
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Coastal waters often support larger blooms of plankton than open water due to a high nitrate level in
runoff. Indicate whether the statement is true or false.
These two countries ended the colonial period with civil wars between Soviet-supported Marxist forces and U.S.-supported pro-Western forces
A) Angola and Mozambique B) Namibia and Botswana C) Rwanda and Burundi D) Nigeria and Biafra E) Ghana and Cote d'Ivoire
Algal blooms result from which type of surface water pollution?
A. heavy metal B. nutrient C. sediment D. PCB
Nearly 300 million years ago, dragonflies existed that were the size of large hawks today. Some scientists believe that these giants could fly then, but not today, because oxygen levels in the atmosphere were much greater
If oxygen levels 300 million years ago were 50% higher than today, what percentage of the atmosphere would have consisted of oxygen for these giant dragonflies? A) 30% B) 20% C) 10% D) 2%