Aquatic habitats include marine, freshwater, and specialized environments. Nutrient-rich waters may become hypoxic. Lakes often exhibit thermal stratification during summer months.
■ Compare the salt content of seawater with that of fresh water and salt lakes.
■ Explain how nutrient-rich runoff can cause waters to become hypoxic.
■ Why would the nutrient content a body of water be more homogeneous than that of a terrestrial environment?
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