Select the three alternative fuels on which a flex-fuel car can run. m ethanol
u propane
methanol
hydrogen
petroleum

Explain one reason why disorders are not easy to classify.

Select the correct answer. what was edwin hubble's contribution to the field of astronomy? a. he discovered variable stars. b. he proved that the heliocentric model accurately described our solar system. c. he found a relationship between the period luminosity and distance of stars. d. he proved that the universe is finite. e. he discovered that the universe was expanding.

Fill in the a is a social institution that undertakes the distribution of power, determining goals, and making choices for society.