They have a long history of war
Answer:
A and B are equally likely
Explanation:
The conditional probability is defined as follows:

where:
is the probability for X to occur, given that Y has occurred
is the probability that both X and Y occur at the same time
is the probability for Y to occur
Given two events A and B, we have:

and

In this problem, we are told that

Which means that:

Simplifying, we get:

which means that A and B are equally likely.
It changed so much because there were always European explorers heading out on voyages, for many reasons (like to trade with neighbouring countries, ferrying people from one land to the other, etc). During those voyages they found new lands, and so the maps had to be revised quite often because of these new discoveries.
Answer:
Explanation:
You have to be very careful in what you think the answer to this question is. It was the task of the Nazis to make the Jewish people as unattractive as they possibly could. Big noses, conformity to head shape, beards (unkept) for the men, completely unattractive women.
These ideas and many others like them were taught in classrooms. There were many fields that contributed to showing that Jews were inferior genetically and Germany had to be cleansed of their presence.