The scientific reason is that the brain directs the gonads and other adrenals to produce large amount of hormones. This causes various physical and emotional changes.
Yes it is not only normal, but required. The reason for puberty is that when you grow up you can make babies.
Each problem has a scientific reason.
scientific reason of ineffective airway clearance
Testosterone which is produced in the testicals plays a major role in puberty and it is the reason why puberty affects your whole body.
You have to mature into an adult sometime. Puberty is the stage in between being a child and being an adult. Every child has to go through Puberty to become an adult. You get your sexual reproduction organs developed through puberty along with growth and strength.
When this happenes you are going through puberty. If this happenes you have hit puberty.
A reason to revise scientific knowledge is this is not a easy subject and we always have to study carefully and revise it.
well i started puberty at about 11 for some reason, probably i was a early bloomer as they say as i started to get pubic hair and the ability to ejaculate.
Onset of menstruation which happens during puberty is termed menarche.
i don't think there is a scientific reason, i think it is because the child cant tell you to stop.
The scientific reason is that broken glass costs money.
Reason and Logic.