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Physical growth (particularly in males), and cognitive development can extend into the early twenties.
Thus age provides only a rough marker of adolescence, and scholars have found it difficult to agree upon a precise definition of adolescence.
In studying adolescent development, adolescence can be defined biologically, as the physical transition marked by the onset of puberty and the termination of physical growth; cognitively, as changes in the ability to think abstractly and multi-dimensionally; or socially, as a period of preparation for adult roles.
Major pubertal and biological changes include changes to the sex organs, height, weight, and muscle mass, as well as major changes in brain structure and organization.
Consequently, girls who have a high-fat diet and who are not physically active begin menstruating earlier, on average, than girls whose diet contains less fat and whose activities involve fat reducing exercise (e.g. They have the advantage in capturing the attention of potential partners and in becoming hand-picked for sports.
Some boys may develop gynecomastia due to an imbalance of sex hormones, tissue responsiveness or obesity.
As with most human biological processes, this specific order may vary among some individuals.
The testes primarily release testosterone, and the ovaries predominantly dispense estrogen.
The production of these hormones increases gradually until sexual maturation is met.
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This is triggered by the pituitary gland, which secretes a surge of hormonal agents into the blood stream, initiating a chain reaction to occur.