Climate Change
              There are many causes and consequences of the climate change. First of all, extending temperatures can be changed in several appearance of weather. Another reason is melting ice and glaciers cause global sea level risen. Finally, variation of climate change affects health and human’s living. (Congonidis, 2011: 1-5)

Reference:
Congonidis, D. (2011). Fact about Climate change. (2011). [Online].Available:
              http://www.thegreatwarning.com/pdf/ClimateChangeFactSheet.pdf).[2011, August 28].

Why do We Need Vitamin C?
                There are several reasons, why vitamin C is very important for health. Firstly, vitamin C is the most  antioxidants. Secondly, it supports the body for fighting infection. Thirdly, it is very important for cementing agent that holds new cells together. Fourthly, it is significant for tissue fixing, bone healing, and maintaining healthy  skin. Finally, it forms  collagen for structuring bones, cartilage, muscle, and blood vessels. (EmaxHealth, 2010: 2)

Reference:
EmaxHealth. (2012). Why do we need vitamin C?. (Online).Available:
http://www.emaxhealth.com/76/1144/html. (2012,September 14).

Computer under attack
          Three kinds of computer virus causing damage for any users. First of all, a Trojan Horse. It is created for stealing a code of credit card or book bank. Spyware, in addition, is the computer virus that is created for saving data of the owner. Finally, Spam. It is used for cheating and obtaining money from people. (Philpot, 2011: 47)

Reference:
Philpot, S. (2011).Academic Skills. Oxford : Spain.

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