What is the speed of light in a vacuum?
How many planets make up our Solar System?
Which of the following blood vessels carries deoxygenated blood?
Which of the following plastic is commonly used for window frames, gutters and drain pipes?
Which of these is NOT a part of the structure of a typical neuron?
About how old is Earth?
Approximately how long is a year on Uranus?
Which of the following men does not have a chemical element named after him?
Which one of these is scientific term for "Brain Freeze"?
71% of the Earth's surface is made up of
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