what is diffusion across general body surfaces means?

Dear student,
Please find below the solution to the asked query

Diffusion is a means of passive transport that involves movement of particles from high concentration to low concentration across a semi permeable membrane.

The diffusion across general body surface means that in some organisms, the movement or exchange of particles like gases occurs through the whole surface of their body.
For example, in frog, the exchange of gases in water occurs through its skin i.e body surface by diffusion.

Similarly, in unicellular organisms like Amoeba, the exchange of respiratory gases occurs across the general body surface here cell membrane.

Hope this information will clear your doubts about the diffusion.
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