Are special versions of a given issue of a magazine, in which editorial content and ads vary according to some specific demographic or regional grouping.

Split runs.

Explanation:

Split runs are special versions of a given issue of a magazine, in which editorial content and ads vary according to some specific demographic or regional grouping. A split run is a change in an advertisement, meaning a change in the wording of an ad through the run, according to some regional grouping. This is usually used to test the effectiveness of the different versions.

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane

answer; they burn down the bushes and trees;