Why do multicellular organisms need a transport system?, To make all their cells the same size, To deliver essential substances to their cells, Which substances do cells need to survive?, Plastic and fuel, Oxygen and nutrients, Why can essential substances not simply reach every cell directly?, Many cells are far from the source of these substances, All cells are located near the outside of the body, What may happen when a transport pathway is blocked or destroyed?, Essential substances may not reach the cells, Essential substances will reach the cells faster, What is one important feature of an effective transport system?, It must deliver substances throughout the organism quickly enough, It must stop substances from reaching the cells

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