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Which planet has the shortest day in the solar system?
Which gas do humans exhale during respiration?
What is the chemical process by which iron rusts?
What is the term for water vapor turning into liquid water?
Which part of the human ear helps maintain balance?
Which scientist discovered the law of gravity?
Which type of rock is formed from cooled magma or lava?
What is the primary component of bones and teeth?
What is the main function of the human skeleton?
Which organ system includes the brain and spinal cord?