<span>Homer Plessy told the conductor he was colored when he knew it would lead to his arrest in an effort to protest the violation of the 13th and 14th amendment. His actions brought awareness to the issue.</span>
Answer: D) Companies replaced hand-operated brakes with air brakes on trains.
The president has the power to veto the laws that Congress passes
i think you mean antibiotic ... but Alexander Fleming was the one who advanced the antibiotic (world) and was responsible for creating these categories of medicine... this affected the 20th century because millions of people use antibiotics everyday and without them... many diseases would still affect people without a cure
