Answer:
a.
Explanation:
The first drawback is basically money. It takes loads of money to lead researches, because you either have to pay a lot of people to collect these data or do it yourself and take years to find a numerous group to provide a good amount for a trustworthy, important research.
The Mongols relied on their fast, efficient pony express system to transmit important government and military information across the empire.
Answer:
D). Ate a varied diet of plants and meat.
Explanation:
Pre-historic hunter-gatherers 'ate a varied diet of plants and meat' as they were dependent on plenty of sources for obtaining their food. They obtained their food by pursuing various activities like 'hunting, gathering/collecting wild herbs and edibles, scavenging, fishing, etc.' Their sole dependence on the abundance of nature made them eat various sources of food until the advent of agriculture 12k years ago. Thus, <u>option D</u> is the correct answer.
The right answer for the question that is being asked and shown above is that: "economy and trade relationship." <span>Trade specialization improves economy and trade relationship around the world. The better the trade specialization, the faster the growth.</span>
