The Figure Below Illustrates Distance and Diffusion Time;note That the Time

question 47

Multiple Choice

The figure below illustrates distance and diffusion time;note that the time required is NOT directly proportional to the distance.Why,for the insect and mouse,might an increase in distance of 20-fold require an increase in time of 60-fold?

• A) Oxygen reacts chemically as it diffuses,becoming less diffusible as it travels greater distances.
• B) Larger animals are warmer than small animals;the rate of diffusion is dependent,in part,on the temperature.
• C) As oxygen disperses into a large area,its concentration declines;the rate of diffusion is dependent,in part,on the difference in concentration between two locations.
• D) Organisms are able to manipulate the rate of diffusion so that the delivery of oxygen matches their metabolic activity levels.

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