3 Questions
Why is diffusion only efficient over small distances?
The time it takes to diffuse is proportional to the square of the distance
In which animals can cells exchange materials directly with the surrounding medium?
Small or thin animals
How do most animals exchange materials with the environment?
Via a fluid-like circulatory system
Test your knowledge of animal circulatory systems and the process of diffusion in this quiz. Explore how small molecules move between cells and their surroundings, and learn about the efficiency of diffusion over different distances.
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