In order to get her 2nd grade students to memorize the poems written on the chalkboard, mrs. thyberg gives the students stickers for each poem they can recite from memory. after earning 5 stickers, a student gets to pick a prize out of the goody box. mrs. thyberg is using (a) to modify the children's behaviors.

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true.b) some other scientific experts read the papers and provide quality control by eliminating many mistakes.c) an editor reads the papers, to make sure that all the semicolons are in the correct places.d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog.e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.