Diffusion rate is proportional to the square of the distance molecules/ions travel. Which of the following would therefore be preferable for a mid-size multicellular organism?
A)direct exchange of nutrients with the surrounding medium
B)a system for bringing nutrients into contact with cells, and another system for bringing to cells $\mathrm { O } _ { 2 }$
C)a system to circulate gases, nutrients, and wastes to and from cells
D)a system for facilitated diffusion to maximize materials that could be exchanged
E)a system of individualized exchange tubules for each cell group

Question

Quizplus · Accepted Answer

A system to circulate gases, nutrients, and wastes to and from cells is preferable because it efficiently overcomes the limitations of diffusion over large distances in multicellular organisms.

Diffusion Rate Is Proportional to the Square of the Distance O2\mathrm { O } _ { 2 }O2​

Diffusion Rate Is Proportional to the Square of the Distance $\mathrm { O } _ { 2 }$