What duck has a shovel-shaped bill?
a. Black duck
b. American widgeon
c. Northern shoveler
d. Gadwall
a
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The muscular action of the ____________________ forces food into the esophagus.
Fill in the blank(s) with the appropriate word(s).
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About what percentage of American households have at least one companion animal?
a. 10 percent c. 50 percent b. 80 percent d. 60 percent
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The higher the _____ content in the soil, the more slowly pesticide-contaminated water moves through it
a. Nitrogen c. Clay b. Water d. Sand
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A schematic explains how to make electrical connections.
Answer the following statement true (T) or false (F)
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