i hate physics (/the moment u realized u never paid attention in class) can somebody answer this question

Blank liquids and gases exert a buoyant force on objects placed in them

If you put a helium-filled balloon in the refrigerator, what will happen?

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?