The most common cause is depression.
I hope this hellps you.
Answer: Influences
Explanation: Kids be around a lot of people or friends be around a lot of people and they can tell kids either good things or bad things that could change the way a person thinks about there selves in each and every type of way.
D. Because when you bite your nails your not in that type of mental state
Don't download unsafe programs , because many contain viruses.
Start and Shut down your computer/laptop properly.
Answer
Cortisol
Explanation:
Cortisol or stress hormone is a steroid hormone produced in the adrenal gland( Cortex) .A spike in the levels of this hormone suppresses Serotonin levels in the blood. Serotonin is a neuro- transmitter in the brain for mood regulation and balance of memory., good sleep sexual function.
A spike in the levels in the cortisol level in the blood brings a corresponding decrease in the levels of Serotonin,which therefore leads to mood swings depression and insomnia,anxiety by reducing the receptors for serotonin,and therefore disrupting Endorphins levels in the brain.
Exercises decreases the levels of cortisol in the blood,and boost the levels of serotonin therefore boosting the amount of serotonin in the blood ,thus promoting good mood, reduce depression etc
