I was wondering if someone could help me with a homework assignment that wants us to identify two major changes or challenges associated with that developmental stage(adolescence, young adulthood, middle adulthood, and late adulthood. For each of three developmental domains: Physical, cognitive, and social/personality.

Answer 1

I can think of many, you place them and describe them:
hormonal related to reproduction
gender identification
development of independence
development of esteem
development of self assurance
cognitive and linguistic ability
ability to problem solve
ability to accept delayed gratification
ability to listen to others
ability to budget ones finances, time
ability to prioritize (and recognize expected value of activities).
development in females of the "nesting syndrome"

Answer 2

Please see my response below.

http://www.jiskha.com/display.cgi?id=1255400558