Which of the following sets of numbers could be used to designate the principal energy levels (shells) in an atom?
A) -1, 0, 1, 2, 3
B) 0, 1, 2, 3, 4
C) 1, 2, 3, 4, 5
D) all of these
C
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What will be an ideal response?
Differential transmissivity of shortwave insolation and longwave terrestrial radiation by various atmospheric gases is better known as the
A) cloud-albedo forcing B) global warming. C) global dimming. D) greenhouse effect.
Compare the population densities of the most and least dense cities on the graph. What is the population ratio of the most- to least-dense cities?
A) 3:1 B) 7:1 C) 70:1 D) 700:1
What is NOT a major human modification of the natural distribution of organisms?
A. physical removal of organisms B. removal of the rainforests C. loss of biodiversity D. introduction of exotic species E. animal succession