The first in males is the increase in size of testis. In females it is menstruation. Also growth of hair in pubic region and on face and underarms.
Evolution of paired limbs was one of major developments . Similarly development of jaws , Amnion etc are also major developments .
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Railroads
At the end of puberty, boys will have a deep voice, notice their emotions are controllable, and become less easily aroused (fewer involuntary erections), and other major physical changes such as hair growth.
Several major economic developments were made in the 1920's. Five of them were sports, immigration, highway systems, increase in money supply, and sexual liberation.
Actually it doesn't show maturity because it shows that they learn their lessons at the end when Dallas dies.....
Testosterone which is produced in the testicals plays a major role in puberty and it is the reason why puberty affects your whole body.
Hitting puberty at the age of 17
The intoduction of Babism and Bahai out of Persia (Iran) was one of the major religious developments of the C19. Further information can be foundf at http://www.bahai.org/
Well puberty is when the body goes through changes to be able reproduce correctly. Boys and girls will notice hair on their underarms, and in their pubic region. Also facial hair will start to grow, only at enhanced rates for boys. Don't worry if your a girl you don have to worry about growing a beard, just maybe a little peach fuzz after a while. Both sexes also get deeper voices, again men notice it more then women, and they also get taller and change in shape a little bit. Men can find muscle growth, height increase, and the "area" getting bigger. Girls also get taller, and their breasts grow. Men will be able to ejaculate semen out of their penis, containing the male sex cell, sperm. Women will produce a natural lubricant when sexually aroused to help the man(when it comes) slide into the vagina easier. These are the biggest thing to see change in puberty and when maturity is reached some of these growths will stop.
Scripture Songs.
Developments in science, art, and philosophy benefited from the interaction of cultures.