By dowloading dodgey software of a dodgey website.
Viruses can be introduced to a computer in many ways. internet(Browsing, Downloading, Emails), Infected Drives(CD/DVD, Floppy Disk, USB Drives, Network Shares)
1950
never
The Barbadons
cornwallis
The British Army
Give three suggestions of how you can ensure viruses are not introduced to the computer system from an external source?
The organs of the immune system fight viruses and bacteria.
the viruses help the immune system adapt and get stronger
The land revenue system which was introduced in Punjab was the Zamindari system.
The dual system in Bengal was introduced by Lord Welesselly
The iqtadari system was introduced by Iltumish in india. This is a system pertaining to division/partition of land.
A Linux system generally gets the least viruses
Windows viruses do not affect the Ubuntu system .
vaccine
Body has got immune system. This immune system or the body immunity forms the antibodies to fight the viruses. The immunity against the viruses is usually life long.
Indians introduced it.
It depends on what kind of virus. Viruses can infect any cell in the human body. Viruses such as HIV infect the immune system; air-born viruses, such as H1N1 or a cold, infect the respiratory system; neurological viruses, like rabies infect the brain (the virus is usually carried to it by peripheral nerves); and viruses like polio effect the nervous system, which can create paralysis.