American cities in the northern United States, such as Chicago, Philadelphia, and Detroit, ________
A) have steadily lost population over the past 100 years
B) have always grown rapidly and continue to do so
C) grew very rapidly in the 19th and early 20th centuries
D) have maintained a steady state population since the 1970s
E) have increased their rate of growth dramatically in the past 20 years
Answer: C
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Because of their high metabolism, small mammals retain heat more effectively than large mammals
a. True b. False
Discuss the composition and characteristics of Earth's layers. How was the composition of the mantle and core determined?
Earth's climate ________
A) history is undeterminable because there is no method of studying the climatic history of the planet B) has been documented to have changed once due to the evolution of green photosynthesizing plants C) has been stable over the history of the planet D) will stabilize over the next century, according to the predictions of most scientists E) is changing as a result of natural and human processes
Which of the following is primarily known as a selective absorber of ultraviolet radiation?
A. water vapour B. carbon dioxide C. clouds D. ozone