It would be found around mountains
The only independent variable in this experiment is the amount of nitrogen Sarah uses. All of the other variables are dependent on other factor and processes, but Sarah controls the amount of nitrogen that she uses for each plant.
The answer to this question is CCR or Central Contractor Registration. The CCR was the main supplier database intended for the United States Federal government. The CCR is the source where it collected data from suppliers, validated and stored the data, disseminated it to various branches in the government acquisition agencies.
