Billy is sitting in a chair in class if the action force is the downward push of his way on the chair what is the reaction force

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?

Explain how organisms could be harmed by high levels of salt from roadways?

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer