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Which part of the human ear helps maintain balance?
Which planet has the shortest day in the solar system?
Which type of rock is formed from cooled magma or lava?
What is the primary function of the human liver?
What is the main function of the human skeleton?
Which gas do humans exhale during respiration?
Which element is essential for photosynthesis besides carbon dioxide and water?
What is the term for water vapor turning into liquid water?
What is the study of the stars and celestial objects called?
Which scientist discovered the law of gravity?