D. Iowa
The corn belt covers Western Indiana, Illinois, Iowa, Eastern Nebraska, and Eastern Kansas. In these states, corn is one of the dominant crops.
People cut down the tropical rainforests and one of the main reason why they do it is so that they can have roads there instead.
It's about the study of the earth. Like mapping, or just looking at different biomes or landscapes.
The right option is; a government program that provides income, food, or housing.
Public assistance is a program organized by the state and federal government to provide financial assistance such as income, food, or housing to disadvantaged groups of people that are unable to provide basic needs for themselves and their families. The beneficiaries of the program include the poor, elderly, unemployed, disabled, or sick.
I want to say it has to be Genetics