Answer:
Supplied the new theory of the universe that combined the work of Copernicus, Kepler, and Galileo.
Explanation:
Newton´s Principia, was the book of Issac Newton that settled down the principles of mechanics, over there the author explain his three laws of movement that are similar in Earth, but also in the universe.
In this book was the beginning of the gravitational force, that latter Einstein will support.
Fire is important because it cooked food, provided light and provided heat
The correct answer is Lake Baikal
