Hall originally used a piece of pure gold to produce the Hall effect, but today a piece of ____________________ material is used instead.
Fill in the blank(s) with the appropriate word(s).
semiconductor
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The respiratory system does all of the following except _____
a. facilitates the exchange of gases c. helps produce sounds b. helps control body temperature d. produces oxygen
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Which government agency is involved in setting gas-fired equipment standards?
A) EPA B) OSHA C) AHRI D) DOE
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Scientists believe that scout bees use the ____________________ to orient their flight and communicate this orientation to the worker bees in the hive.
Fill in the blank(s) with the appropriate word(s).
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In the U.S., more money is spent each year on pet food than baby food.
Answer the following statement true (T) or false (F)
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