Which of the following statements regarding the origin of life is false?
A) Life originated on an Earth whose atmosphere contained no oxygen.
B) Miller and Urey generated amino acids and many other organic molecules by shooting electric sparks through a model of Earth's early atmosphere.
C) The first genes were probably made of DNA, not RNA.
D) When certain lipids are added to water, they spontaneously form structures that resemble cell membranes.
C
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Which strategy has the city of Curitiba, Brazil used to greatly reduce the emissions of greenhouse gases compared to cities of comparable size?
A. Creating a car-free zone in the center of the city. B. Planting two trees for every one cut down. C. Instituting a site-and-service program for poor residents. D. Free daycare for low-income residents.
Cyclones are areas of low pressure. They are associated with
A. cirrus clouds. B. stationary fronts. C. rough weather. D. calm weather.
This cloud may develop an "anvil head"
What will be an ideal response?
What ethnic group in China practices Islam and has faced opposition from the government?
A) Naxi B) Uyghur C) Hui D) Miao E) Zhuang