Answer:
better maps show the directions of ocean currents and lines of latitude. Inventions like the astrolabe and magnetic compass improve navigation.
Explanation:
Bill is on the 6th row ! The first 4 letters
Alright, basic research basically means finding out an answer to fill in the knowledge that people don't have or we have while applied research basically means to seek the question with an answer and solve the problem. hope this explains it :))
-For 50 years they were the center of East coast African slave trade
This was answered before, I believe...
Hope this Helps!