Identify the correct developmental sequence, from earliest to ...

[WWatsford]

Identify the correct developmental sequence, from earliest to last, in the appearance of these vocalizations:
 
  a. babbles :: holophrases :: coos.
  b. holophrases :: babbles :: coos.
  c. coos :: babbles :: holophrases.
  d. holophrases :: coos :: babbles.

Question 2

Ethical guidelines allow children to serve in research
 
  a. only with informed consent of the parent or guardian.
  b. as long as the children's names do not appear with data.
  c. without parental informed consent, so long as the child agrees to participate.
  d. if each child is suitably rewarded with toys or candy.

[pikon]

Answer to Question 1

C

Answer to Question 2

A

[WWatsford]

TYSM

[kusterl]

Thanks for the timely response, appreciate it