___ is the most common childhood-onset behavioral disorder, with ...

[Wadzanai]

___ is the most common childhood-onset behavioral disorder, with estimates that ___.
 
  a. Autism; there is one such child out of every 20.
  b. ADHD; the percentage of children diagnosed in the U.S. is 11 and rising
  c. Attention deficit hyperactivity disorder; 1 of every 3 boys and 1 of every 5 girls are affected
  d. ADD; the percentage of children diagnosed in the U.S. is 25 and rising

Question 2

Multiple sclerosis involves:
 
  a. Loss of myelin in the central nervous system
  b. Loss of myelin in the peripheral nervous system
  c. Loss of myelin in both the central and peripheral nervous systems
  d. None of the above

[Missbam101]

Answer to Question 1

B

Answer to Question 2

A

[Wadzanai]

Excellent

[xiazhe]

Wow, this really help