During the 1950s people lived on average more than two decades longer in developed countries than in developing ones. In the twenty-first century, the gap is ________
A) less than 5 years
B) less than 10 years
C) less than 15 years
D) still the same
E) increased to 30 years
Answer: B
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Consider a simple food chain in which a grasshopper eats grass, the grasshopper is eaten by a frog, and the frog is eaten by a snake. Which of the following is not correctly matched
A) grass — autotroph B) grasshopper — herbivore C) frog — secondary consumer D) snake — primary consumer
The positive growth pattern in Mozambique indicates that even desperately poor countries can work to improve the standard of living for their people if there are adequate resources and opportunities.
a. true b. false
Throughout the world, the most water is used for
A. agriculture. B. industrial processes. C. heating and cooling. D. transportation. E. urban uses.
Most earthquake destruction results from
A) primary (P) waves. B) secondary (S) waves. C) surface waves. D) acoustic waves.