Physical features and environmental conditions primarily influence a region's - • form of government
O social class system
O population distribution
O religious beliefs

Population distribution is primarily influenced by physical features and environmental conditions.

Explanation:

iThe areas in which people have been settling historically, but nowadays as well, have always been the areas that offer the best conditions. Basically, the more suitable the physical features and environmental conditions, the more people will move in and live in the area, and vice versa. This can be noticed very easily if we see where the population is most concentrated and where it is very sparse.

The areas that are dominated by lowlands through which there is river/s passing by, with temperate or mediterranean climate, tend to be the best for the people to live in. This can simply be attributed to the abundance of water, fertile soil, and pleasant climate. On the other hand, the areas dominated by steep mountains, deserts, tropical rainforests, taiga, and tundra have always been avoided because of the extremes in the climate and poor living conditions.

b.) plain  

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