Why was trading nessecary in prehistoric times?

What have plant predecessors may have been contained? Where did Paul Bunyan move and why? What was the atmosphere like in the Permian period? Is kerogen a fossil or biomass fuel? Who invented trampling? Why were Poseidon and Demeter lovers? What does the domestication of plants and animals suggest about the development of humans? What is a presevitive? How did cabeza de vaca survive? What was the flora that was widely distributed throughout the late paleozoic southern hemisphere landmass? Are Neanderthals real? What was the powers of fauna the roman goddess? What are Paleolithic tents made of? What is P-R-E-P? When was petrol invented and by who? Was Australopithecus a biped or quadruped? What was the tepee made of old stone age people? How did the first humans survive before the farming? What is printmaking during the prehistoric period? Why did sabor toothed tigers go extinct?