Some scientists have been critical of the laboratory tests conducted by the federal drug administration on the grounds that the amounts of suspected carcinogens fed to animals far exceeds those that humans could consume.

A, c, and d are the answers

Urban growth invariably feeds increased commercialization and industrialization. it requires continually expanding land areas. when urbanization rates are high, and countries do not have the institutional and managerial capacities or economic wherewithal to manage such rapid growths, they exert intense pressure on the types and nature of the resulting settlements. they contribute to the development of overcrowded slums and shanty towns without adequate essential services and necessary infrastructure.-by asit k. biswas and cecilia tortajada

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