the person that helps out others even his/her enemy when in need is regarded as a good person.
War, people go against each other, poverty
Answer:
The main reason why mountains are rarely populated is because of the harsh climate that are dominating in those areas. On the other side, another important reason is that mountainous areas are not fertile enough and people are not able to grow crops. Lack of resources therefore is obliging people to move from the mountains to lower terrains.
Explanation:
Because of the mentioned reasons most of the people since the beginning of civilization were inhabiting river valleys and the areas that have better climate.
For example, Chinese civilization developed in the valley of Yangtze and Huang He and not Himalayas.
Sounds like the answer is D because they usually purchase those cars to save gas or fuel also known as a source of energy.