B. Play soft music in the background while studying.
Answer:
I think you put this in the wrong subject
Explanation:
Answer: Both crops are very labor intensive and require many hands therefore the livelihood depended upon the massive amount of slave labor
Explanation:
Claudius Ptolemy (87-150 A.D) was a famous Greek map maker or cartographer. He was also a geographer and astronomer. He gave instructions for map making which included a system of coordinates. He also used longitudinal and latitudinal lines on his maps.