The principal force affecting world population distribution is
A) age-dependency ratio
B) famine
C) migration
D) natural increase
E) plague
D
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Which of the following would be used to kill weeds?
A. herbicides B. rodenticides C. fungicides D. insecticides E. natural enemies
What element is behaves as the oxidizing agent in the following equation and what element behaves as the reducing agent? Sn2+ + 2 Ag ? Sn + 2 Ag?
A. The tin ion, Sn2+, is the oxidizing agent, while silver, Ag, is the reducing agent. B. The tin, Sn, is the reducing agent, while silver ion, Ag?, is the oxidizing agent. C. The tin ion, Sn2+, is the reducing agent, while silver, Ag, is the oxidizing agent. D. The tin, Sn, is the oxidizing agent, while silver ion, Ag?, is the reducing agent.
The genes of an organism make up its ________, and the traits of an organism make up its ________.
A. phenotype; genotype B. genotype; phenotype C. phenotype; chromosomes D. enzymes; genotype
Wave base is _____
a. the level of a wave trough b. the level of a wave crest c. found at a depth of one half the wavelength d. found at a depth of twice the wave period e. sea level