Answer: A. To break down food into nutrients that can be circulated around the body. :)
When an ecosystem has a scarce nutrient, that is when there is a nutrient limitation.
So the answer is C. <span>Nitrogen is typically the limiting nutrient in freshwater environments.
This is because Nitrogen is the "scarce" nutrient </span>
some important molecules are too large to pass through the cell membrane.
Hope this helps!
-Payshence
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C) neurons - nerve tissue - brain - central nervous system - human being