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What is the term for water vapor turning into liquid water?
What is the primary component of bones and teeth?
Which gas do humans exhale during respiration?
Which organ system includes the brain and spinal cord?
What is the primary function of the human liver?
What causes the phases of the moon?
Which planet has the shortest day in the solar system?
Which type of muscle is found in the heart?
What is the chemical process by which iron rusts?
What is the term for an animal that eats both plants and meat?