Who invented a machine that revalized the way sugar was made?

An education expert is researching teaching methods and wishes to interview teachers from a particular school district. she randomly selects ten schools from the district and interviews all of the teachers at the selected schools. which type of sample did she use in this study? a)systematic sample b)probability sample c)stratified sample d)cluster sample

The second reading at mass, is taken from which part in the bible? a) letters b) new testament c) old testament d) gospels

When children heard an interesting story about a sympathetic and resourceful african-american child, the aim was to provide them with?