Platoweb earth and sience A unit 2 post test?

What type of commercial speech is not protected by the 1st amendment?

Ahigh school teacher wants to study the seating habits of students in the cafeteria to determine if students sit in the same seats or change seats from day to day. she sits in the cafeteria for several days, and without interacting with the students, records where they sit each day. what is a potential benefit of this type of research? there is an independent variable. there is a dependent variable. the researcher can gain personal information about an individual. the participants act normally. the information can be gathered over a period of several years.

List and define the two main problems when heavy pumping of wells occurs?