What is diffusion in flower plant

drop of food coloring in a glass of watercolors the water through diffusion. ... At night, however, the stomata simply remain open and CO2 enters the plant through diffusion. Flower Feathers

Explanation:

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .