The most abundant fossil fuel is D, coal!!!!
Civilization in each region developed advance math,science, and engineering.
Answer:
Increase government spending in order to stimulate the economy
Explanation:
The correct answer is agriculture. It was made possible for people to live on a single piece of land and not be nomadic anymore in search of food. Agriculture enabled them to settle around river valleys like Nile or Tigris and Euphrates. This is the era when civilizations started rising worldwide.
