Because of the lack of plant cover in deserts, variations in bedrock and soil color in deserts visually stand out.
a. true
b. false
Ans: a. true
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The Cascade Range in North America is predominately volcanic and plutonic in character
a. True b. False
The introduction of genetically modified (GM) crops into developing nations needs to be monitored because
A) many GM seeds are more costly or require substantially greater costs to grow. B) most GM crops do not thrive in tropical environments. C) many farmers make high profits from GM crops, sell their farms, and move to cities. D) GM seed providers cannot make a profit in developing nations because of theft and piracy.
Relative to sustainable agriculture, insects' roles are as ________
A) essential pollinators and predators B) invasive species C) keystone species D) genetically modified species E) harmful herbivores that need to be eliminated
The blood-brain barrier is permeable to which of the following species?
A) Cl- B) alcohol C) Na+ D) none of these