Which of the following is correct?
A.A Winogradsky column is used to filter out microorganisms from a water sample taken from a deep black smoker
B. A Winogradsky column is used to demonstrate interactions and gradients that occur in aquatic environments
C. Both (a) and (b)
D. A Winogradsky column is used to filter out microorganisms from non-aquatic environments
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c both a and b are correct
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