It isn't protected against all viruses .. see related link.
no completely no.
Unix systems may be affected by viruses .. see related link.
Macintosh is based upon Unix, so when you compare the 2, you are comparing a type of unix and windows. Unix is generally thought of as safer and less susceptible to attack by viruses.
That is not really a true statement; any operating system is capable of being infected by viruses,worms, etc. Windows has a much larger base, and is therefore more of a target than Unix.
Computers are susceptible to viruses unless they are protected by special software and firewalls.
Unix uses anti-virus programs the same way other systems do; there is nothing present in the system to protect it from virus programs.
Not at all. Both Unix and Windows are trademarked and copyright protected so they cannot share a common code base.
Yes. Macintosh and other UNIX based systems are still at risk of getting viruses and trojans, however they are extremely rare.
it will kill our computer
Any malware may not attack a given system if it is targetted to a specific system. Unix systems are vulnerable to viruses and malware just as other systems are.
First of all, Unix (and even Linux) is NOT virus free. Although rare, there are viruses for such systems.One of the primary reasons that Unix / Linux do not get as many viruses is that the ability of different users is limited. Non-technical users will be restricted in their ability to install, run, or modify software. More experienced users will usually be given more privileges. Without inexperienced users installing software at a whim, over 90 % of the threat of viruses and malware is removed.Linux is even further protected against viruses because Linux is by nature a heterogeneous platform. To be effective, the program would have to be capable of affecting multiple versions of the kernel, and use exploits in a variety of programs.
Largely, they aren't, to any real degree.