A prominent feature of the vocal part in the music of this selection (Links to an external site.) is:. 1. the heterophonic texture. 2. the use of call-and-response. 3. the drone/ostinato throughout. 4. its harmonic chord progression.

b. The use of call-and-response  

Explanation:

The call and response are that when you say something and somebody replies to it. Call and the response in the form of musical melody. It follows the first phrase and follows the second phrase. The first phrase is presented like the questions and the second phrase is like an answer. Call and phrase look like the melodious answer for all in modern music. This also goes into the roots of modern music.  

Thus a prominent feature of the vocal part of the music of the selection is the use of the call and response.

the use of electrical signals that transit messages is know as

answer; group behavior;