With age, what happens to the brain? Some parts grow. ...

[Deast7027]

With age, what happens to the brain?
 
  Some parts grow.
  Activity level always decreases.
  Using both hemispheres simultaneously becomes more likely.
  Brain reserves increase.

Question 2

Why have scientists recently begun to realize that some of their long-held beliefs about the aging brain were false?
 
  People are living longer.
  Older people have become more aware of their own brain functioning.
  Noninvasive imaging techniques that can be done on live brains have
  become available.
  More laboratory analyses of brains of deceased Alzheimer's patients have
  been conducted.

[cassie_ragen]

Answer to Question 1

Using both hemispheres simultaneously becomes more likely.

Answer to Question 2

Noninvasive imaging techniques that can be done on live brains have
become available.

[Deast7027]

Excellent

[Viet Thy]

Gracias!