What forms whenever a large body of air over land or water does not move for a long period of time?

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?

As a result of these processes the single celled organism accomplishes

Which state of matter has the following physical properties: ~ takes the shape of the container it is in ~ takes the volume of the container it is in ~ low density. answer is gas