Depends on your browser, a bookmark or favorite is a webpage that you visit repetedly and so you dont need to type in the URL all the time, for example on google chrome i can press the star on the URL to the right and make a bookmark.
The astrolabe and the caravel <span />
I just took the test and the answer to this question is B: Europe after the Norman Conquest
The answer to your question is really simple. If the Portuguese could not trade by land, they wanted to find an alternative route to Asia - WATER! Therefore, that's when the Exploration Age began. The Portuguese wanted to discover a water route to India and the West Indies to trade for spices.
You will see that explorers like Vasco da Gama and Bartolomeu Dias were famous navigators that attempted to do that.
