Science

What makes up about 70 percent of most living things?

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What is the process by which a plant grows from a seed?
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Mariner IV sent the first pictures of which planet back to earth?
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What spacecraft takes astronauts into space, orbits the Earth and can be flown more than once?
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Ice pellets are also known as what?
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How many years are in a sunspot cycle?
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What cellular organelles produce proteins?
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What is the name of the spacecraft that took the first men to the moon?
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Who was the scientist to propose the three laws of motion?
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