A group of researchers want to determine the average concentration of mercury in zooplankton in all the lakes in a regio

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A group of researchers want to determine the average
concentration of mercury in zooplankton in all the lakes in a
region. They randomly selected 10 lakes from all lakes that were
within 500 m of a road in that region, and measured the
concentration of mercury from 5 g of zooplankton collected from the
top 2 meters of water from those lakes.
Based on this description, explain what the target population,
the sampled population, and the sample are in this example. Note at
least one reason that the sampled and target populations might
systematically differ in the target variable (mercury
concentration). (3 marks)