The scientific peer-review process ensures that
A) scientific studies have proper design and methods and are free from bias.
B) all scientific studies receive publication despite the level of bias.
C) the results of scientific studies are permanent and certain.
D) all published scientific studies have clearly defined control groups.
A
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A freely falling boulder has a speed of 40 m/s. One second later, its speed is
A. 10 m/s. B. 50 m/s. C. 30 m/s. D. 40 m/s.
Approximately what fraction of Nigerian citizens live in cities?
A) one-third B) one-quarter C) one-half D) two-thirds E) three -quarters
In the seventeenth century, ________ became the first modern urban country, with over one-half of its population living in cities and towns
A) England B) The Netherlands C) Spain D) France E) Greece
A factor that can influence earth's temperature but not be influenced by humans is
A. aerosol concentration. B. variations in solar radiance. C. atmospheric albedo. D. surface albedo.