"<span>b. Wealthy merchants in northern Europe offered enormous sums of money to Renaissance artists who would reveal their secrets" was not a way in which this happened. Renaissance artists and thinkers were not secretive with their methods or ideals. </span>
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There was agriculture developed there so it mean that there was enough food for both the people and the cattle. Also there were many trading routes through the area so it was possible to sell anything animal related, from food to clothes to leather armors to anything that you could think of.