School, stressed out the majority of students and young adults attending classes.
Explanation:
Serotonin is the key hormone that stabilizes our mood, feelings of well-being, and happiness. This hormone impacts your entire body. It enables brain cells and other nervous system cells to communicate with each other. Serotonin also helps with sleeping, eating, and digestion.
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The five levels of organization in a multicellular organism are cells, organs, tissues, organ systems and organisms. The caliber of intricacy and functionality increases going from cells to organisms.
