What is the most abundant element on earth?
A) Water B) Nitrogen C) Oxygen D) Hydrogen
D
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Companion animal control problems are a 20th century development
A. True B. False
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Conservation tillage systems are now in use on some 85% of the cropland in the USA
Indicate whether the statement is true or false
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Hitches and slipknots are the most popular knots when rigging.
Answer the following statement true (T) or false (F)
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The ____ wave is the most basic and widely used of all the AC waveforms.
A. sine B. square C. triangular D. sawtooth
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