Adolescence /ˌæd

evolve /ɪˈvɒlv/ /-ˈvɑːlv/ verb [ I or T ]
to develop gradually, or to cause something or someone to develop gradually
Humans evolved from apes.
The company has evolved over the years into a multi-million dollar organization.
Bacteria are evolving resistance to antibiotics.
explain /ɪkˈspleɪn/ verb [ I or T ]
1. to make something clear or easy to understand by describing or giving information about it
If there's anything you don't understand, I'll be happy to explain.
The teacher explained the rules to the children.
[ + question word ] Our guide explained wh ere the cathedral was.
He explained how the machine worked.
Please could you explain wh y you're so late.
[ + that ] She explained that she was going to stay with her sister.
[ + speech ] "Someone must have hit the wrong button," an official explained.
[ R ] Molly asked the teacher if she could explain herself a bit more clearly (= say more clearly what she meant) .
No one has been able to explain (= give the reason for) the accident.
2. explain yourself
to give reasons for your behaviour
He hadn't been home for three days so I asked him to explain himself.