I think because of the climate of the Paleolithic era only certain plants to grow their and only certain animals lived in the era
Because desert was humid and was always tiring for long travels. camels helped bring goods because they could survive without water for 10 days but caravans helped people relaxed and take a breather and sometimes it also was a place for people to exchange ideas and goods instead of traveling fully.
The axis gains early in the war changed fortune in 1942 when the allies made important turn around. The allies fortune was mainly changed by two factors which was the fatal defeat of the Germany forces at the battle of Stalingrad,one of the most deadly battles in history, and the USA entry into the war on the side of the allies.
B. Indigo, cotton, rice, tobacco