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What is the correct symbol for a particle?
Jeffrey Arnett
An American psychologist known for his theory of emerging adulthood, a development phase between adolescence and full-fledged adulthood.
Immune System
A complex network of cells, tissues, and organs that protects the body against infection and disease by identifying and destroying pathogens.
Physical Development
The process that starts in human infancy and continues into late adolescent, involving the growth of the body and the development of both gross and fine motor skills.
Amenorrhea
Amenorrhea is the absence of menstruation - one or more missed menstrual periods. Women who have missed at least three menstrual periods in a row have amenorrhea, as do girls who haven't begun menstruation by age 15.
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