The following diagram is of a cross section of a plant leaf. Use the diagram to answer the question.
The main function associated with structure X is ________.
Definitions:
Urinalysis
A test of urine to detect and manage a wide range of disorders such as urinary tract infections, kidney disease, and diabetes.
Countercurrent Exchanger
A mechanism by which heat or some chemical constituents are exchanged between flowing fluids moving in opposite directions to maximize transfer efficiency.
Vasa Recta
A series of straight capillaries in the kidney that function in the concentration of urine.
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