Final answer:
Robert Koch developed Koch's postulates, which verified the germ theory of disease and linked specific pathogens to specific diseases.
Step-by-step explanation:
The scientist who developed a series of proofs that verified the germ theory and could be used to determine which organism caused which disease was Robert Koch. Known for his Koch's postulates, Robert Koch established a protocol to determine the cause of infectious diseases, which allowed him and his colleagues to identify the specific pathogens causing diseases such as anthrax, tuberculosis, and cholera.
This systematic approach solidified the connection between specific microbes and specific diseases, supporting the germ theory of disease and paving the way for modern bacteriology.