Answer:
first and last one is the answer
New aqueducts brought fresh water from hundreds of miles away and Huge tunnels were built for sewer lines.
Because they were so close to these rivers, they serve as sources of drinking water. What gave opportunity for people to settle and become sedentary, focusing initially on agriculture and land security, with this the population grew and avoided the risks of nomadic communities, not having to go to places unknown or dangerous or run out of food. Therefore, over time they then focused on more complex areas such as politics, economy and architecture. Promoting the development of the community that over the years were the foundations of modern civilization.
The highest classes such as the Pharaoh himself and his loyal and royal friends. This was because they had enough money to build pyramids and organize burial rituals and thus brag of their wealth even in death.
It generates heat by any mechanical activity mostly by a respiration which is by breaking the glucose
