Biology Revision

Surface area = number of surfaces x height x length.

Volume = height x width x length.

Single celled organism.

This is an amoeba. They have large surface areas compared to the volume. This allows sufficent transport of molecules into and out of the cell to meet the needs. These do not need specialised structures for transport.

Surface area;

As the distance between the centre of the organism and the surface get bigger, simple diffusion is no longer…