A weak osmoconcentrator will have

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A weak osmoconcentrator, such as many small mammals or animals in a freshwater environment, tends to have primarily cortical nephrons. Cortical nephrons have a shorter loop of Henle, which is less effective at concentrating urine compared to the longer loops found in juxtamedullary nephrons. This is because a longer loop of Henle is essential for producing highly concentrated urine, as it allows for more extensive reabsorption and concentration of solutes.

A Weak Osmoconcentrator Will Have