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What are some of the problems that had to be solved before a useful sewing machine could be invented?
All of the above
Oxygen
All of the above
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preserve food
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state
Time and Effort
Modern Appliances are designed to save
All of the above
Oxygen
All of the above
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preserve food
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state
Time and Effort
Accurate clocks were needed for:
All of the above
Oxygen
All of the above
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preserve food
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state
Time and Effort
What are three types of lightbulbs
All of the above
Oxygen
All of the above
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preserve food
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state
Time and Effort
The main reason refrigerators were invented
All of the above
Oxygen
All of the above
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preserve food
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state
Time and Effort
Refrigeration requires a substance to change
All of the above
Oxygen
All of the above
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preserve food
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state
Time and Effort
This must be removed from a light bulb to prevent burning of the filament:
All of the above
Oxygen
All of the above
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preserve food
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state
Time and Effort
Explain how a refrigerator works:
All of the above
Oxygen
All of the above
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preserve food
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state
Time and Effort
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