Unlike Prokaryotic cells, eukaryotic cells can actually have different roles instead of the same cell over and over. This, obviously, leads to more complex creatures. Basically, a theory (now proven correct) called The Big Gulp explains how we took in small prokaryotic organisms to do the roles for us. For example, mitochondria makes proteins so we do not have to waste our own organisms protein.
Answer: Thermal energy refers to the energy contained within an object that changes its temperature. Heat is the energy of thermal energy. A chemical change happens when one substance and another substance form into two or more different substances.
