Foods from animals supply about 88 percent of vitamin ____________________, which is very difficult to obtain from plant sources.
Fill in the blank(s) with the appropriate word(s).
B12
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The major difference between a standard relay and a contactor is the ____ of the contacts.
a. operation b. number and size c. metallic content d. current carrying capability
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Good ethics are still a very important part of a good business.
Answer the following statement true (T) or false (F)
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?Plastics always contain the element ____.
A. ?carbon B. ?silicon C. ?oxygen D. ?nitrogen
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The epiglottis prevents food and water from entering the respiratory system
Indicate whether the statement is true or false
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