2. Nitrates in drinking water - An example of the scientific process Aa Aa Compl

Question

2. Nitrates in drinking water - An example of the scientific process Aa Aa Complete the following problem to understand the various steps that may be incorporated into the scientific process There is no dispute that the levels of nitrogen-containing compounds have increased in the world's water supply due to increased use of fertilizers and combustion of fossil fuels. According to the World Health Organization, many communities are exposed to drinking water that exceeds the present standard for nitrate (NO3) in drinking water. As such, there is a growing concern for how increased levels of nitrates in drinking water can affect human health Imagine that you are interested in the role that this problem plays in your own community. Upon investigation, you learn that scientists have developed the hypothesis that increased nitrates in drinking water are associated with increased cases of methemoglobinemia in infants, a disease that interferes with the oxygen-carrying capacity of blood. Further, you learn that there is typically a higher concentration of nitrates in water drawn from private wells compared to water drawn from public wells Given this information, which of the following is an appropriate projection that would test the hypothesis that there is a link between nitrates in drinking water and methemoglobinemia? O The number of cases of methemoglobinemia will be lower among infants who drink from public wells compared to infants who drink from private wells O Methemoglobinemia will have no effect on infants who live near private wells or public wells O Infant diseases are caused by living in areas that have public and private wells Nitrate concentrations (mg/L] Suppose you go out and collect data, hoping to see whether you can support your hypothesis First, you go out in your community and measure the amount of nitrates in water drawn from public wells and water drawn from private wells. Second, you survey the number of cases of infant methemoglobinemia and note whether infants drank water drawn from the public or private wells in your community 40 20 Your first set of data on average nitrate concentrations in different wells is illustrated in the graph. Measured in milligrams per liter (mg/L), the concentration of nitrates from private wells is nitrates from publichigher than 10 the concentration of Public Private Type of well lower than the same as

Explanation / Answer

The first hypothesis is the best amongst all the three because here we are discussing condition of methemoglobinemia from drinking of water of both types of wells.

Here we choose in the first blank- higher than because private wells generally do not take out more water than public wells. Water from wells need to bring out on regular basis.

The second blank would be then- is. Yes it is supported.

The third blank is frontier. We still cannot separate the cause of methemoglobinemia by nitrates.

The fourth blank is drawback.

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