In Deep Lakes and Ponds,no Light Reaches the Lower Layer

question 2

Multiple Choice

In deep lakes and ponds,no light reaches the lower layer of the water column.Which of the following would you predict might take place at this bottom layer?

• A) There will be an abundance of predators and prey
• B) There will be many aerobic bacteria
• C) Dissolved oxygen levels will be low
• D) Primary productivity will be high

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