Find an equation of the tangent plane to the parametric surface represented by r at the specified point. 
; u = ln 9, v = 0
Definitions:
Podocytes
Specialized cells in the kidneys that wrap around capillaries of the glomerulus, playing a critical role in the filtration of blood to form urine.
Bowman's Capsule
A structure in the kidneys that encloses the glomerulus and initiates the process of filtration to form urine.
Glomerulus
A network of capillaries located in the kidney that plays a key role in filtering blood to form urine.
Freshwater Environment
A habitat characterized by water with low salt content, such as rivers, lakes, and streams.
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