Thyroxin functions as an animal hormone, while cytokinin acts as a plant hormone. Insulin, classified as an animal hormone, and estrogen, also an animal hormone, are essential in various physiological processes. Specifically, cytokinins play a role in stimulating cell division, with higher concentrations found in regions undergoing rapid cell division, such as in fruits and seeds.
So, the correct answer is option (D).
Write the equation for the relationship as on a logarithmic scale.