Why May It Take Months to Years for Some Zones

question 16

Multiple Choice

Why may it take months to years for some zones of the Winogradsky colum to develop their characteristic colors? (Select all that apply)

• A)oxygen intially present throughout the column may inhibit initial growth of anaerobes
• B)some microbes grow more slowly than others
• C)biofilm communities may have to form to allow microbial consortiums to exchange nutrients
• D)the plastics of column containers need to be altered by sunlight to permit microbial metabolism
• E)all are correct choices

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