Types of social problems include which of the following

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

What would happen to the tides if there was no moon and no sun in the sky?

Why were the gods angry at odysseus in the odyssey