Cells usually cannot use heat to power mechanical work because (2 points) question 2 options: 1)  after several energy conversions, there is not enough energy in heat to power cellular functions 2)  as the heat increases the cell's temperature, it must be released to prevent cell damage 3)  heat is a waste product of chemical reactions and not a true form of kinetic or potential energy 4)  there is not enough of a temperature difference within the cell for heat to be able to flow