____ organisms have cells of varying shapes and sizes that suit their role. These cells are much larger in size and are far away from the supply of ____ and ____ resulting in them having a ____ surface area to volume ratio. As such, they require a ____ system to get materials where needed efficiently to sustain life of the cells as well as to remove excretory ____ materials from these cells. Only cells that are found at surfaces or lines body organs and cavities such as the ____ cells can transport materials by ____. All other cells are ____ on the transport system for sustenance. The ____ is a liquid tissue which acts as a vehicle to transport these materials to every cell in the body.

Short discussion explaining the need for a transport system

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