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

question 33

Multiple Choice

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

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