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The process by which plants lose water in the form of vapor is called:
The hardest natural substance found on Earth is:
The pH value of pure water at room temperature is:
The energy released when a substance burns in the presence of oxygen is called:
Which vitamin is produced in human skin upon exposure to sunlight?
The chemical formula for common table salt is:
Rusting of iron is an example of which type of reaction?
Which of these is not a renewable source of energy?
The normal body temperature of a healthy human is approximately:
The study of heredity and variation in living organisms is called: