Thomas, a war veteran, still experiences occasional aches in the arm that was amputated when he was injured in a war. in the context of sensory receptors and the brain, thomas's condition best illustrates the phenomenon of

Thomas’ condition best illustrates the phenomenon of phantom limb pain. This is defined as a painful sensation that occurs continuously and the pain is likely to be coming from the part of the limb even if in truth, it was no longer existent though the pain is real.

the values of the selma marchers was to bring   their ability to vote into law. mlk was not hat march, which was protesting toward lbj

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."