What did jackson issue the species circular

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 renting agent says i have to rent for at least one year. but i’m not sure how many months i’ll be in town.

How long was the government shutdown?