Answer to Question 1
Personal interviews imply a direct face-to-face conversation between the interviewer and the respondent, as opposed to telephone interviews. In both types, the interviewer asks the questions and records the respondents' answers, either while the interview is in progress or immediately afterward. Mail questionnaires are sent to designated respondents with an accompanying cover letter. The respondents complete the questionnaire at their leisure and mail their replies back to the research organization. Internet-based questionnaires involve either e-mails sent to respondents, who in turn reply to the e-mail with their answers, or surveys that are completed by respondents via the Web.
Answer to Question 2
random-digit dialing
Four main models that describe the relationship between ecosystem function and biodiversity.
Three chromatographic methods used in protein purification
The thorax of apes, including humans, is broad but shallow in contrast to the narrower, deeper chest
Absorption Methods in the Intestine
Methods to prevent pregnancy
Main Types of Dietary Lipids