Lifestyle and it's D I think lol
Question asked:groups of organs that work together to complete a process in the body are called
My answer is: An <u><em>organ system </em></u>is made from a group of different organs, which all work together to do a particular job
The part of muscle that he needs to train is the Slow-twitch muscle fibers.
<h3>What are Slow-twitch muscle fibres?</h3>
The Slow-twitch muscle fibers are the muscle fibres that are used to support long distance endurance journey such as the marathon race.
Therefore, the part of muscle that he needs to train is the Slow-twitch muscle fibers.
Learn more about muscle here:
brainly.com/question/13920046
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