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Read the passage found in the World Geography online textbook (Topic 1: Introduction to Geography, Lesson 10: History Basics, the Measuring Time page.) Then, answer the question: Prehistory is the time before

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Modern human beings existed
People left written records
People created calendars
People began to study history

Prehistory is the time before modern human beings existed. It refers to the period in history before the invention of writing and the creation of written records. During this time, humans relied on oral traditions and passed down stories and information through word of mouth. Prehistoric humans also did not have calendars or any formal system of measuring time. As a result, much of what we know about prehistoric times comes from archaeological evidence, such as tools, artifacts, and cave paintings. It was only after the development of writing that people were able to record and study history in a more systematic way. Therefore, the correct answer is: People left written records.

Read the passage found in the World Geography online textbook (Topic 1: Introduction to Geography; Lesson 7: Trade and Development, Trade Barriers and Free Trade page.) Then, answer the question: Which of the following is best describes a trade barrier?

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A ban on all trade with a country and thus differs from tariffs and quotas.
A limit set on the number of units of a good that can be imported.
A tax on imports or exports.
A government policy or restrictions that limits international trade.

A trade barrier can be described as a government policy or restrictions that limits international trade. Trade barriers can take various forms, such as tariffs (taxes imposed on imports or exports), quotas (limits imposed on the quantity or value of goods that can be imported), or even outright bans on trade with a particular country. However, the best description that encompasses all forms of trade barriers is that they are government policies or restrictions that limit international trade. Therefore, the correct answer is: A government policy or restrictions that limits international trade.