(08.05 MC) People entering the United States from foreign countries are required to declare certain items they are bringing with them from those countries. In many cases, travelers are not allowed to bring foreign fruits, vegetables, or meats into the United States. What is the most likely reason for this?

(08.01 LC) The stratospheric layer is destroyed by

(07.05 MC) This graph compares the dose-response curves for a lethal dose of a particular toxin and a dose that results in brain damage: According to the graph, approximately how much larger is the LD50 dose for this toxin than the ED50 dose resulting in brain damage?

(07.01 MC) Which of the following best shows the results of biomagnification from years of rainfall washing mercury (Hg) into bodies of water such as lakes, rivers, and streams?

(07.06 MC) In which situation has the precautionary principle been most strictly applied?

(08.04 LC) A forest has just been clear-cut to make room for a subdivision and has increased carbon in the atmosphere. What is the impact of deforestation on oceans?

(08.05 MC) A national park is discovered to be a habitat for an endangered species of frog. Which of the following statements explain how being listed as endangered under the Endangered Species Act could help save the frog from extinction? The Endangered Species Act prohibits logging, grazing, and mining in the frog’s habitats. The Endangered Species Act allocates federal funds to supply the frogs with food when their prey is scarce. The Endangered Species Act prohibits people from trapping frogs or destroying their habitats.

(07.04 LC) Primary treatment of wastewater includes

(07.04 LC) Tertiary treatment of wastewater includes

(07.02 LC) Which of the following would be the cause for dead fish in a lake?