The answer i believe is Tone
Personality. Percy is good-natured, friendly, brave, and willing to risk his life to save his friends, strangers, and even his enemies. He is angered by Thalia Grace because their personalities are similar, they argue even though they are good friends. Percy has a sarcastic sense of humor and is funny in his writing.
Hope this helps :)
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Laughter enhances your intake of oxygen-rich air, stimulates your heart, lungs and muscles, and increases the endorphins that are released by your brain. Activate and relieve your stress response.
You can control anything but nothing.