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Author Question: By the age of ____, most children can be entertained by riddles and jokes. a. 4 to 6 c. 7 to 9 ... (Read 60 times) |
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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The familiar sounds of your heart are made by the heart's valves as they open and close.