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Adolescence - A transitional phase of growth and development between childhood and adulthood. The World Health Organization (WHO) defines an adolescent as any person between ages 10 and 19. This age range falls within WHO’s definition of young people, which refers to individuals between ages 10 and 24.

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Puberty -  In human physiology, the stage or period of life when a child transforms into an adult normally capable of procreation, occurring between ages 11 and 16. It tends to peak at about age 12 for girls and age 14 for boys, however, increasing numbers of girls have started puberty by age 7 or 8. In 2010 a study of girls in three U.S. metropolitan regions revealed that some 10.4 percent of white girls, 14.9 percent of Hispanic girls, and 23.4 percent of black girls had begun puberty by age 7. Generally, puberty occurs earlier in black girls, the age range in the United States being between ages 9 and 14, compared with an age range between 10 and 14 for white girls.

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STEM, in full sciencetechnologyengineering, and mathematics, field and curriculum centered on education in the disciplines of science, technology, engineering, and mathematics (STEM).​ And now includes art (STEAM or STEMA) for designing and maintaining overall infrastructure.
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The birds and the bees
From Wikipedia, the free encyclopedia
For other uses, see The Birds and the Bees (disambiguation).

"The Birds and the Bees" is an English-language idiomatic expression and euphemism that refers to courtship and sexual intercourse. The "Birds and the Bees talk" (sometimes known simply as "The Talk", is generally the event in most children's lives in which the parents explain what sexual relationships are.

According to tradition, the birds and the bees is a metaphorical story sometimes told to children in an attempt to explain the mechanics and good consequences of sexual intercourse through reference to easily observed natural events. For instance, bees carry and deposit pollen into flowers, a visible and easy-to-explain parallel to male fertilisation. Another example, birds lay eggs, a similarly visible and easy-to-explain parallel to female ovulation.
Nursing is also responsible for encouraging the health of individuals, families, and communities in medical and community settings. Nurses are actively involved in health care research, management, policy deliberations, and patient advocacy.
Biology - The study of living things and their vital processes. The field deals with all the physicochemical aspects of life. The modern tendency toward cross-disciplinary research and the unification of scientific knowledge and investigation from different fields has resulted in significant overlap of the field of biology with other scientific disciplines. Modern principles of other fields—chemistry, medicine, and physics, for example—are integrated with those of biology in areas such as biochemistry, biomedicine, and biophysics.

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Public Health - The art and science of preventing disease, prolonging life, and promoting physical and mental health, sanitation, personal hygiene, control of infectious diseases, and organization of health services. From the normal human interactions involved in dealing with the many problems of social life, there has emerged a recognition of the importance of community action in the promotion of health and the prevention and treatment of disease, and this is expressed in the concept of public health.

via Britannica.com