Aristo was riding in a car and noticed a pond that was covered in algal blooms due to excess phosphorus in the water. Which of these other features in the landscape could be the reason for the high levels of phosphorus?

Cow manure contains phosphorus, and runoff from a pasture can carry it into nearby water. Excess phosphorus can fuel algal blooms, so a cow pasture is the most likely source. Forests and solar panels are not typical phosphorus sources, and cars do not usually add much phosphorus to ponds.

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