What religion was introduced into Northern Europe in the 800's but took off at a slow pace?

The most common economic system in the world is aclosed economy.command economy.mixed market economy.traditional economy.

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

When reading a textbook blank. a) it’s safe to assume that the ingot is not biased b) you should watch for fallacies in information and author bias c) you should fact check everything you read d) it is understood that academic sources are not biased