The answer is the second one: Many Mongolians are pastoral nomads who raise livestock for a living.
In the age of exploration.... Prince Henry showed the Portuguese how to navigate by studying the sun and stars until later on, he showed them the compass navigation as the only technology advance which made possible for them.
Answer:
With the new inventions of fossil fuel, air pollution has soared to new heights. Factories and power plants are also a huge part of it along with the oil industry that is wrecking the oceans.
Explanation: