-multicellular organism therefore have large diffusion distance and high demand
-Need a transport system to deliver nutrients and remove waste from all cells
-Transport system in humans/mammals is called the circulatory system
-circulatory system made of heart, blood vessels and blood (heart pumps blood, blood vessels carry blood, blood carriers nutrients/waste.)
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A-level Biology Notes
General FictionTopics 1-4 of A-level Biology AQA New specification