Which of the following are discoveries that were made in the nineteenth and twentieth centuries?

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All of the above options are discoveries made in the nineteenth and twentieth centuries. Joseph Lister's use of antiseptics was introduced in the 1860s. Ernst von Bergmann developed aseptic techniques in the late 1800s. Louis Pasteur's germ theory, which proved that microorganisms cause disease, was established in the mid-1800s. Wilhelm Roentgen discovered x-rays in 1895.

Which of the Following Are Discoveries That Were Made in the Nineteenth