http://www.youtube.com/watch?v=Rpj0emEGShQ
Virus has DNA and RNA. It also doesn't have cells.
Viruses don't reproduce them-selfs because they need cells to make copies of each other by sending DNA to the Nucleus to create RNA and same copies of each other.
They don't develop unless they were just produced by a cell.
Viruses effect the environment but they are not effected that much. Unless the immune system kills them.
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