Answer:
<h3>I THINK ITS LETTER B</h3>
Explanation:
I HOPE IT HELPS :)
it is TRUE that our immune systems don't work as well when as well when we're under psychological stress.
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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Drug addiction is a chronic disease characterized by compulsive, or uncontrollable, drug seeking and use despite harmful consequences and changes in the brain, which can be long lasting. These changes in the brain can lead to the harmful behaviors seen in people who use drugs. Drug addiction is also a relapsing disease. Relapse is the return to drug use after an attempt to stop.