The second one is A, amount of time
Yes because rivers are important for trade and even things like fresh water and transport.
False. All behaviors do not occur only after conscious thoughts. According to Thomas Huxley, conscious thoughts don't do anything. This coincides with the modern view of this topic. Conscious thought is not the all-powerful controller of behavior. Moreover, the unconscious was more seen to be capable f guiding people on what to do.<span />
This would be by the influence of migration and distinct ethnic groups of each country