They switch roles after every five cycles CPR or about every two minutes.
<h3>What is CPR?</h3>
The term CPR is the acronym for cardiopulmonary resuscitation. It is an important first aid that is administered to a person that has a sudden heart attack.
If more than one responder is available and trained in CPR, they switch roles after every five cycles CPR or about every two minutes.
Learn more about CPR:brainly.com/question/13320397
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What is time dilation?
Answer: Time dilation is the difference of time between two events. This events are measured by two different observers that are moving relatively to each other or that are present two different places.
I hope it helps, Regards.
The structure is called the Eustachian tube.
Hope I could help.
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