What must be true about two objects if heat is flowing between them?

Tell me the answer choices and i would be able to answer. : )

Alily leaf is a plant whereas a cat is an animala lily leaf cell is a plant cell and a skin cell is an animal cell

Van der waals forces are temporary electromagnetic forces established between uncharged atoms. some neutral molecules, when close together, can become temporarily “charged,” as electrons move around the atom. water is a polar molecule, the side of the molecule that the hydrogens bond to being more positive, and the opposite side bound to the lone pairs of electrons being more negative. this means that it participates in dipole-dipole interaction (non-polar exhibits dispersion forces), and it has the capacity for hydrogen bonding.