Researchers sometimes avoid open-ended items on questionnaires ...

[mynx]

Researchers sometimes avoid open-ended items on questionnaires because such items
 
  a. are not very scientific.
  b. permit too limited a range of responses.
  c. can result in responses that are difficult to code and categorize
  d. generally provide details about behaviors but not the context in which they occur.

Question 2

Differentiating populations based on biological characteristics involves the concept of
 
  a. ethnicity.
  b. race.
  c. physical culture.
  d. psychological culture.

[johnpizzaz]

Answer to Question 1

C

Answer to Question 2

B

[mynx]

Excellent

[komodo7]

Thanks for the timely response, appreciate it