What are two physical changes that take place in the teen brain ? how are these changes significant?

A teenager's brain is still only 90-95% developed. During adolescence, the brain strengthens the connections. This is the brain's way of becoming more efficient. Because the prefrontal cortex is still developing, teenagers might rely on a part of the brain called the amygdala to make decisions and solve problems more than adults do. The amygdala is associated with emotions, impulses, aggression and instinctive behavior. These changes are significant because they are crucial to how a teen transfers into adulthood.

nope, but i have cleaned my brush in my cup of not as potentially harmful but nevertheless, very upsetting for scottish/british folks. especially if you've used the last teabag for it

explanation:

there could be something in that . . i am indeed an old scottish man!

there's a bit of bolshie-ness with it too though. i won't let go of the old ways . . tea and whisky . . whether the young whippersnappers like it or not!