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Asymptomatic gallstonesa) develop symptoms at a rate of 2% per yearb) at a rate of 20% per yearc) don't increase chances of bladder cancerd) small stones decrease risk of cancer

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What will happen to methane levels in the atmosphere at 60°N60°N to 75°N75°N latitude from 2018 to 2027 if the trend from 2011 to 2017 continues?AMethane levels in the atmosphere will increase because of increased growth of producers at latitudes greater than 60°N60°N.BMethane levels in the atmosphere will increase because melting or thawing permafrost will lead to an increase in the amount of organic matter that will decompose.CMethane levels in the atmosphere will decrease because melting sea ice will increase transportation in the ocean by ships at latitudes greater than 60°N60°N.DMethane levels in the atmosphere will decrease because oil and gas exploration will increase as permafrost continues to melt or thaw.

Based on the data shown in the graph, which of the following is the most plausible hypothesis for the cause of the trend in CO2CO2 levels from about 5,000 years ago to the present?AVolcanic activity, which can release over 6 million tons of carbon dioxide per year, has contributed to an increase in ash and dust in the atmosphere, which trap CO2CO2. This has caused an increase in CO2CO2 in the atmosphere over the past 5,000 years.BHuman activity, especially the burning of fossil fuels, has led to an increase in anthropogenic carbon dioxide emissions. This has caused a doubling in the concentration of CO2CO2 in the atmosphere.CErosion of limestone from sedimentary rock, a result of physical and biological weathering, has released a large amount of carbonic acid into the atmosphere. This has caused a decrease in the concentration of CO2CO2 in the atmosphere.DIncreasing rates of photosynthesis in the summers, which are a direct result of increased global temperatures, have led to an increased release of CO2CO2 in warmer months. This has caused the seasonal cycle of CO2CO2 concentrations in the atmosphere.

One important drawback of the use of HCFCsHCFCs as a replacement for CFCsCFCs is that HCFCsHCFCsAbiomagnify in food chains in the Arctic ecosystemBcombine with water vapor to form acid precipitationCare greenhouse gases that contribute to climate changeDreact with carbon monoxide (COCO) to form ozone in the troposphere

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