Which factor has the most influence in earth's climate? a. metal b. landforms c. interstates highways d. crops

Landforms. This is because they can shift their structure, and they have an effect on where people live, (such as living on a plain or by a mountain). They change where people grow food, for example, you are less likely to grow food in a snowy place, rather than a plain. 

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Master planned communities outside of chicago. note: population density means people living in an area per square mile. chicago, an urban and highly populated area has a much more higher density than a desert, amish community, settlement, or nomadic region.