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Which scientist proposed the theory of relativity?
Which mineral is essential for strong bones and teeth?
What is the main gas responsible for the ozone layer?
What is the term for animals that are active at night?
Which part of the brain controls balance and coordination?
Which organ produces antibodies to fight infections?
What is the process by which liquid changes to gas called?
What is the freezing point of water in Celsius?
Which disease is caused by a deficiency of iodine?
Which vitamin helps in blood clotting?