Here's why:

* Greek Theory: Ancient Greek philosophers like Democritus proposed the idea of atoms as the fundamental building blocks of matter. However, their ideas were based on philosophical reasoning, not scientific evidence.

* Dalton's Contribution: Dalton, through his experiments and observations, provided scientific evidence to support the existence of atoms. He proposed the following:

* All matter is made up of atoms: This solidified the idea of atoms as the fundamental building blocks of matter.

* Atoms of a given element are identical: He proposed that atoms of the same element are alike in size, mass, and other properties.

* Atoms of different elements are different: This further solidified the idea of distinct atoms for each element.

* Chemical reactions involve the rearrangement of atoms: Dalton understood that atoms combine in specific ratios to form compounds, explaining chemical reactions.

Therefore, Dalton's work provided the scientific foundation for the atomic theory and helped revive the idea of atoms from ancient Greek philosophy.