Molecules at room temperature move freely. What happens to the molecules when heat is removed until it freezes?

Molecules group together
Molecules slow down and contract
Molecules speed up and expand
Molecules move freely

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

answerscientific theory;