[Solved] Comparing preadolescent 5th graders to adolescent 8th graders,Larson and Richards (1994)found that the percentage of time participants experienced as "very happy" ____. A) increased by 60% B) increased by 20% C) decreased by 30% D) decreased by 50% Illegal Behavior: Actions or activities that are prohibited by law, ranging from minor offenses to serious crimes against persons or property. Adolescents: Young people in the transitional stage of physical and psychological development that generally occurs during the period from puberty to legal adulthood. Precocious Puberty: The onset of puberty occurring at an unusually early age, often defined as before 8 in girls and before 9 in boys. Sexual Activity: Behaviors associated with the expression of sexuality and erotic desire, including intercourse and other forms of physical intimacy between individuals.