. Which of the following is correct?

Question

Options:

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

Answer: Option B

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