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Selenium can conduct (photoconductive/semiconductor behaviour).
Hence the keyed answer is Selenium.
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Oxygen makes up the largest share of body mass.
So the correct answer is Oxygen.
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Lunar escape speed is less than Earth's because of lower mass (and size).
Hence the keyed answer is Less than on Earth due to its lower mass and smaller radius.
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Vitamin K is needed for clotting; lack causes blood clotting disorders.
So the correct answer is Blood clotting disorder.
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Bats navigate by echolocation using ultrasonic waves.
So the correct answer is Ultrasonic Waves.
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