Fick's law of diffusion describes the factors that influence the diffusion of respiratory gases across biological membranes like gills and lungs. Diffusion rate = k × A × P₂- P₁)/D. Natural selection is least likely to act upon which variable in Fick's law?

Question

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Natural selection is least likely to act upon the rate constant (k) in Fick's law because it is a physical constant and is not influenced by biological factors or inherited traits that could be subject to selection. The other variables, such as surface area (A), concentration gradient (P₂- P₁), and membrane thickness (D), can vary depending on an organism's physiology and ecology, and may therefore be subject to natural selection.

Fick's Law of Diffusion Describes the Factors That Influence the Diffusion