What make it difficult to represent the model of an atom?
A. Atoms are much larger than their nuclei.
B. Atoms are not hard spheres with well-defined edges.
C. Electrons are too small to be shown to scale.
D. Electrons are constantly in motion and do not truly follow orbital paths.
E. All of these choices are correct.
Answer: E
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Which of these diseases is both infectious and communicable?
A. tuberculosis B. malaria C. West Nile disease D. Lyme disease
Which of the following is true about the European Union?
A) A country must be a EU member to issue euros. B) All EU member countries use the euro. C) The economically weaker countries were forced to implement unpopular policies such as cutting services and raising taxes. D) The German mark is still in wide use in Europe. E) The European Parliament is elected by the people in each of the member states in a sequential manner.
Complete the concept map by selecting the correct responses from the lists provided. 
Complete the concept map by selecting the correct responses from number 1.
A. Foci B. Cracks in the crust C. Vibrations D. Epicenters
Since 1843, the primary British base of operation in the Pacific Northwest was where?
A) Fort Alexandria B) Fort Oregon C) Fort Vancouver D) Fort Victoria