Ayoung child is flying on a plane for the first time. as the plane begins its decent for landing, his ears begin to hurt. the flight attendant sees that he is in pain and tells him to swallow until the pain goes away. which structure is the child using to equalize the pressure and relieve the pain?

can you explain a little further maybe give multiple choice? ?

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."

answer; strong state government;