In the 18th century, Italian biologist Lazzaro Spallanzani designed an experiment supporting the hypothesis that gastric juices are partly responsible for digesting food. Which human illness did Spallanzani's work eventually shed light on?

Spallanzani showed that gastric juices help digest food, establishing that these juices act inside the stomach. His findings later helped scientists understand stomach ulcers, which occur in the stomach lining. The correct choice is stomach ulcers.

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