The water is found mainly in the protoplasm,
and here it plays vital roles in many functions, for example in metabolism in all
organisms, and photosynthesis and support in plants. Humans cell consists are 60% water.. In humans, blood is used to transport food, hormones, oxygen, waste
products and so on, and similarly in plants, sap is used to transport food
and other substances. Both of these mediums for transports (blood and sap)are
mainly water, as this is the solvent which can dissolve the products to be transported.
Blood allows oxygen to be transported to tissues, and waste products to be
quickly removed. It also facilitates the transport of hormones, to control various organs.