Final answer:
Stars are primarily made of hydrogen and helium. Nuclear fusion in stars leads to the creation of heavier elements.
Explanation:
Stars are mainly composed of hydrogen and helium. These two elements make up the majority of a star's mass, with hydrogen accounting for about three-quarters and helium for almost a quarter. Nuclear fusion reactions in stars produce heavier elements like oxygen, carbon, neon, iron, nitrogen, silicon, magnesium, and sulfur.
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