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In the lab, students are working with substances that could cause burns. Which of these safety precautions is most important to follow?

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Katia was listening to music on the radio. In order for the sound to be produced, the electrical energy must be converted into which type of energy?

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A calculation based on the chemical energy of gasoline shows that a car should be able to go 100 miles on a gallon of fuel. When the car was driven on a test track, the car only went 25 miles on a gallon of fuel. What accounts for most of the difference?

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What abiotic factor would most likely signal a population of birds that it is time to migrate from north to south?