Fact 1: Operating an automobile usually requires fossil fuels. Fact 2: Fossil Fuels Fuels that are formed in the earth from plant or animal remains. Given the two facts above, what does operating an automobile usually require?

Choices:
a). bus.
b). bicycle.
c). Animal remains.
d). hydrogen and oxygen.
e). energy usage.
f). ramp.
g). Time and energy.
h). solid, liquid, gas.
Answer:
c).