What type of device is a car engine?
a. a heat pump that uses heat to do work
b. a heat engine that uses work to move heat
c. a heat pump that uses work to move heat
d. a heat engine that uses heat to do work

Answer;

B.A heat engine that uses work to move heat

Explanation;A heat engine involves a thermodynamic process that converts the heat supply in it into mechanical work.A heat engine makes use of the properties of thermodynamics to transform heat into work. Gasoline and diesel engines, jet engines, and steam turbines that generate electricity are all examples of heat engine

Because they're in different places for this the temperature varies.

Amicroscope, because these cells are so small that you would not be able to see them, or what they attack without it.