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Water has a number of unique properties, making it vital for organisms to survive. Without it, life would not ever have evolved. It provides surface tension, allowing many organisms to support themselves

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Introduction

Water Water is essential to life itself; with out water life on earth would not exist. Water is a major component of cells, typically forming between 70% and 95% of the mass of the cell. This means that we are made from approximately 80% water by mass and some soft bodied creatures such as jellyfish are made of up to 96% water. Water also provides an environment for organisms to live in, 75% of the earth is covered in water. The properties of water are essential for organisms to live in for a variety of reasons. The one that is most evident is its transparency. The fact that light can travel through it allowed marine life millions of years ago to develop a more sophisticated detection device other than sonar, sight. This is evident with many types of fish using visual effects to deter predators, like schools of fish in a large mass to make it seem as though they are bigger than they actually are. Coupled with the fact that light can travel through water, so can heat; which is essential for aquatic plants to photosynthesise. Water has a molecule of oxygen contained within it; this means that aquatic Organisms such as dogfish are able to extract that molecule for respiration using a series of vascularized gills. ...read more.

Middle

It is also seen in the vascular tissues in plant phloem transport of sucrose and amino acids in solution. All living things need continuing supplies of water to survive. A plant needs water to keep up the internal pressure or turgidity in its cells and tissues (which maintains the plant's shape), to bring in dissolved minerals and raw materials from the soil, and for photosynthesis. The fact that water contains two hydrogen atoms and one oxygen atom is Essential for photosynthesis. During the light dependant stage, the hydrogen molecules of water are separated from the oxygen molecule. And in the light independent stage, the hydrogen molecules from water, react with the carbon dioxide to form a carbohydrate. The process of osmosis is only possible because of the size of the water molecule. Because it is so small, water is able to travel through the semi-permeable membrane of cells in living organisms, which larger molecules cannot fit through. This is useful in plant cells, as water is lost in transpiration, it can easily be replaced by this process. Creating a water column through the plant. Water also plays a key role in the metabolic breakdown of such essential molecules as proteins and carbohydrates. ...read more.

Conclusion

However with the density properties being as they are water is most dense at 4�C. This means even when a pond is frozen over there is a layer of water below the ice at 4�C where organisms can survive. Another importance of water is its lubricating properties. Joint are lined with lubricating membranes. These occur in the space between the bones of most joints. The membranes lining the joints are known as synovial membranes. This is because they secrete synovial lubricating fluid. The hollow tracts, such as the respiratory and glandular ducts are also lined with membranes. Water has a number of unique properties, making it vital for organisms to survive. Without it, life would not ever have evolved. It provides surface tension, allowing many organisms to support themselves and move efficiently. It provides the perfect environment for chemical reactions to take place, due to the fact that it is a universal solvent. Water also has a very high heat capacity, allowing organisms to maintain the appropriate body temperature, which is vital for their survival. Finally, water has a unique structure, involving polarity and hydrogen bonding. By considering these examples and the many others that have also been discussed, it is clear to see how unique and important the chemical and physical properties of water are to all living organisms. ...read more.

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