The primary function of the probe is to: a. loosen up the respondent. b. get the correct answer from the respondent. c. get the respondent to answer a question more fully. d. indicate an understanding and interest in the respondent all of these choices.

c. get the respondent to answer a question more fully.

Explanation:

A probe is applied to promote conversation without affecting the answer. It is especially appropriate for open-ended questions. Probes are utilized more commonly in open-ended questions than in closed-ended ones. The basic function of a probe is to provide the respondent to answer the questions completely.

c. taught scientists many new things about the earth, but not other planets.

explanation:

answer; decreased;