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Which scientist discovered the law of gravity?
Which organ system includes the brain and spinal cord?
What is the term for water vapor turning into liquid water?
What causes the phases of the moon?
Which gas do humans exhale during respiration?
Which type of muscle is found in the heart?
What is the primary function of the human liver?
What is the term for an animal that eats both plants and meat?
Which planet has the shortest day in the solar system?
Which vitamin is important for wound healing?