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Which gas is commonly used in balloons to make them float?
Which disease is caused by a deficiency of iodine?
What type of lens is used to correct nearsightedness (myopia)?
What is the process by which liquid changes to gas called?
What is the study of heredity called?
Which part of the brain controls balance and coordination?
What causes the greenhouse effect on Earth?
What is the main gas responsible for the ozone layer?
Which human organ is primarily responsible for producing bile?
Which scientist proposed the theory of relativity?