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Which organ in the human body is primarily responsible for filtering blood?
Which gas do plants absorb from the atmosphere for photosynthesis?
Which part of the human body produces insulin?
What is the boiling point of water at sea level in Celsius?
What is the normal body temperature of a healthy human in Fahrenheit?
What is the hardest natural substance found on Earth?
What is the unit used to measure atmospheric pressure?
Which human organ is primarily responsible for producing bile?
What causes the greenhouse effect on Earth?
What is the study of heredity called?