The primary sexual characteristics are the production of sperm in boys and the production of eggs in girls. All the other changes, such as growth of pubic hair, axillary hair (armpit hair), chest hair, facial hair, growth of breasts, lowering of a boy's voice, changing body shape etc etc are secondary sexual characteristics.
The male hormone brings the secondary sexual characteristics during puberty. It gives growth and muscles too.
All of the secondary sex characteristics in males are due to testosterone produced in the testicles including; facial hair, penile and testicular growth, increased muscle mass, deeper voice, etc.
adrenals
During puberty, the penis and testis increase in size. also , the libido of a person increases. Males start ejaculating and masturbating to achieve orgasm.
adrenals
adrenals
Females usually experience an increase in body fat during puberty as a secondary sex characteristic.
All the secondary sexual characteristics.
Isolating the problem
Between those ages the puberty starts, triggering primary and secondary sex characteristics of both male and female. During this period, a person may also go through growth spurt and voice change.
yes, you create sperm during puberty.
There are a lot more than four, however some are: Body odour Deeper voice (including Adam's apple) Hair growth Increased muscle mass Bigger stature (broader chest and shoulders) And many more!