Levels of CO2 and methane in the atmosphere have been increasing over the years. What effect is this having on conditions on Earth? A. Allowing too much heat to escape into space. B. Leading to a rise in global temperatures. C. Interfering with the uptake of phosphorus gases by primary producers. D. Increasing the rate of biological magnification. Rocot Soloction

Figure 20.12 Which of the following statements about the nitrogen cycle is false? a. Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4+) . b. Denitrification by bacteria converts nitrates (NO3) to nitrogen gas (N2) . c. Nitrification by bacteria converts nitrates (NO3) to nitrites (NO2) . d. Nitrogen fixing bacteria convert nitrogen gas (N2) into organic compounds.

The process whereby oxygen is depleted by the growth of microorganisms due to excess nutrients in aquatic systems is called _________. a. dead zoning b. eutrophication c. retrophication d. depletion

INTERTRET DATA Scientists have compiled databases of large forest wildfires in the western United States and compared them to climate and land-surface data. Examine the graph showing wildfire frequency compared to average springsummer temperature. Do you see a correlation? If so, describe it. Based on these data, do you think that climate warming is causing more wildfires? Explain your answer.