Essay on The Role of Water in the Lives of Organisms

Essay on The Role of Water in the Lives of Organisms

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Water is essential to life itself; without 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. Water is kept
flowing over these gills by a specialized pumping system. And it is
due to the density of water, in comparison to air, that prevents the
gills from collapsing on top of each other. This is shown when a fish
is taken out of water.

Water is a simple molecule made up of an oxygen atom and two hydrogen
atoms, H2O. The hydrogen and oxygen atoms are bonded covalently. The
two hydrogen atoms form a bond with t...


... middle of paper ...


...ension, 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.

Bibliography-

www.bbc.co.uk

www.google.com

www.chem1.com

www.biology-online.org

www-hpcc.astro.washington.edu/scied/biology

www.clemson.edu/biolab/home.html

www.biolinks.com/

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