I want to know the answer to the following question:
Which theory did the law of conservation of mass disagree with?
All the background I'm provided with is that "The theory that all matter is made of atoms, which are the smallest constituents of matter that cannot be broken down without losing the basic chemical and physical properties of that matter, was provided by John Dalton in 1803, although the question took a hundred years to settle as proven.". Is that enough to answer the question?
Answer: no