Sunday, 9 December 2012
Friday, 7 December 2012
Viruses are not alive, so they do not have a need for food like living organisms. Viruses do not have an organized cell structure. They are so light that they can float in the air or water, be passed on to other organisms if touched, and fit anywhere. The virus injects its own DNA structure into healthy cells where new virus cells grow.
There are an example of viruses :
|Virus in blood|