What are the primary colors of Light?

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Diameter of Sun is_____________?

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Which of the following is a mammal?

A. Ostrich B. Crocodile C. Platypus D. Duck...

The atmosphere near the earth’s surface is “heated from below.” Which of the following does not significantly contribute to this heating _____________________?

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Siemens is the unit of__________________?

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what are stars mainly made of ?

A. Balls of gass B. Rock C. Ice D. Light...