It introduced the use of coal oil and natural gas as sources of fuel.
I think the answer is the first one
Answer:
a. the moral majority was on group that helped elect Ronald Reagan.
Explanation:
Since conservatives contributed to the election of Ronald Reagan as US President in 1980. They were opposed to hippie counterculture and are opposed to legalization of drugs in the United States, and some of them consider liberals as agents of Communism.
The philosophers during the middle ages believed that the geocentric model of the Universe was the one that is true. This model presupposed the Earth being the centre of the universe and the Sun revolving around the Earth - this, of course, isn't true.
