Theresa is working on her dissertation and is assigning participants to the experimental and control groups by chance. She is using

It indicates no change in temperature and the process of matter changing its state

Scissors and a seesaw both cut things that’s the only comparison

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.