(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?

(07.04 LC) Tertiary treatment of wastewater includes

(07.04 LC) Secondary treatment of wastewater includes

(08.05 MC) Many national parks that allow camping prohibit people from carrying in firewood from other areas. What is the most likely reason for this?

(07.04 MC) This diagram shows the treatment process used at a certain water treatment plant. Shortly after the plant is constructed, the operators discover that water treated at the plant still contains tiny particles of sediment. Which process is missing from the water treatment plant?

(07.03 MC) An advantage of disposing of municipal solid waste in a landfill rather than in an incinerator is that, unlike incinerators, landfills

(07.02 MC) Which of the following, if it occurs near a wetland, could lead to eutrophication?Runoff from crop fields that have been treated with large doses of fertilizerOil runoff from roadsLeeched metals from a mine

(08.01 MC) A political action group that wants to overturn the Montreal Protocol monitors the ozone layer via satellite across the South Pole for the months of May and June. They find that the layer has the same thickness as the historical average. They claim that ozone depletion was not affected by the protocol. What is the major flaw in their reasoning?

(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.

Extra credit question: If you were to talk as loudly as you possibly could, the pitch of your voice would not change from your standard speaking voice’s fundamental frequency (2 points)