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Students researched monkeys at a zoo. They recorded the monkeys' traits and behaviors. This investigation activity is best described as

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The atomic mass of an atom is

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Which statement correctly describes why there are fewer than 24 hours of daylight in Alaska during each day in April?

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When a book is dropped onto a wooden desk, the molecules in the wood begin to vibrate from the force of the book. Which of these is produced by the vibrations?