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? intestinal ulcers mouth ulcers stomach ulcers skin ulcers

Stomach ulcers, I've read it online and I take the test

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl